Hello. I have this same issue:
2018-12-17 13:14:45 DR server started
2018-12-17 13:14:45 Binded to localhost
2018-12-17 13:14:45 Binding UDP socket to local address 192.168.2.141
2018-12-17 13:14:45 Running Corona DrServer build Nov 21 2018 on TCP/UDP ports 19666, loopback TCP/UDP19667
2018-12-17 13:14:45 Available 3dsmax versions:
2018-12-17 13:14:45 2018: C:/Program Files/Autodesk/3ds Max 2018/
2018-12-17 13:14:45 Running command:
"C:\Program Files\Autodesk\3ds Max 2018\3dsmaxcmd.exe" "C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\corona_dr.max" -continueOnError -gammaCorrection:1 -rfw:1 -sf -v:5 -postRenderScript:"C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\post.ms"
2018-12-17 13:14:46 Started loopback connection with 3ds max
2018-12-17 13:14:47 Cannot contact 3ds Max, trying again ...
2018-12-17 13:14:47 3dsMax started successfully
2018-12-17 13:14:47 Accepted remote connection from 192.168.2.138
2018-12-17 13:14:47 Started connection #1
2018-12-17 13:14:47 Handshake: <root><DataType>0</DataType><Handshake>init</Handshake><FrameName>0</FrameName><HostVersion>Max2018</HostVersion><CameraName>CoronaCamera002</CameraName><Region>0 0 0 0</Region><ImageSize>2560 1440</ImageSize><MD5>8d4061bcc6ad3c1592a73083d424b08b</MD5><CoreVersion>3</CoreVersion><IpAddress>192.168.2.138</IpAddress></root>
2018-12-17 13:14:47 Saving incoming scene to C:/Users/MERC B2/AppData/Local/CoronaRenderer/DrData/received_scene_1046268152.max
2018-12-17 13:14:47 Downloaded scene: 10 280 960 bytes in 0 s
2018-12-17 13:14:48 Render for connection #1 started
2018-12-17 13:14:49 Received sampling focus mask (region 0 0 2560 1440)
2018-12-17 13:15:18 Closing loopback manager
2018-12-17 13:15:19 DR is finished
2018-12-17 13:15:19 Ready for new connection
2018-12-17 13:15:19 Running command:
"C:\Program Files\Autodesk\3ds Max 2018\3dsmaxcmd.exe" "C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\corona_dr.max" -continueOnError -gammaCorrection:1 -rfw:1 -sf -v:5 -postRenderScript:"C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\post.ms"
2018-12-17 13:15:20 Started loopback connection with 3ds max
2018-12-17 13:15:21 Cannot contact 3ds Max, trying again ...
2018-12-17 13:15:21 3dsMax started successfully
2018-12-17 13:15:21 Accepted remote connection from 192.168.2.138
2018-12-17 13:15:21 Started connection #2
2018-12-17 13:15:21 Handshake: <root><DataType>0</DataType><Handshake>init</Handshake><FrameName>0</FrameName><HostVersion>Max2018</HostVersion><CameraName>CoronaCamera002</CameraName><Region>0 0 0 0</Region><ImageSize>2560 1440</ImageSize><MD5>8d4061bcc6ad3c1592a73083d424b08b</MD5><CoreVersion>3</CoreVersion><IpAddress>192.168.2.138</IpAddress></root>
2018-12-17 13:15:21 Saving incoming scene to C:/Users/MERC B2/AppData/Local/CoronaRenderer/DrData/received_scene_2920131845.max
2018-12-17 13:15:21 Downloaded scene: 10 280 960 bytes in 0 s
2018-12-17 13:15:22 Render for connection #2 started
2018-12-17 13:15:23 Received sampling focus mask (region 0 0 2560 1440)
2018-12-17 13:15:52 Closing loopback manager
2018-12-17 13:15:53 DR is finished
2018-12-17 13:15:53 Ready for new connection
2018-12-17 13:15:53 Running command:
"C:\Program Files\Autodesk\3ds Max 2018\3dsmaxcmd.exe" "C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\corona_dr.max" -continueOnError -gammaCorrection:1 -rfw:1 -sf -v:5 -postRenderScript:"C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\post.ms"
2018-12-17 13:15:54 Started loopback connection with 3ds max
2018-12-17 13:15:55 Cannot contact 3ds Max, trying again ...
2018-12-17 13:15:55 3dsMax started successfully
2018-12-17 13:15:55 Accepted remote connection from 192.168.2.138
2018-12-17 13:15:55 Started connection #3
2018-12-17 13:15:55 Handshake: <root><DataType>0</DataType><Handshake>init</Handshake><FrameName>0</FrameName><HostVersion>Max2018</HostVersion><CameraName>CoronaCamera002</CameraName><Region>0 0 0 0</Region><ImageSize>2560 1440</ImageSize><MD5>8d4061bcc6ad3c1592a73083d424b08b</MD5><CoreVersion>3</CoreVersion><IpAddress>192.168.2.138</IpAddress></root>
2018-12-17 13:15:55 Saving incoming scene to C:/Users/MERC B2/AppData/Local/CoronaRenderer/DrData/received_scene_713897738.max
2018-12-17 13:15:55 Downloaded scene: 10 280 960 bytes in 0 s
2018-12-17 13:15:56 Render for connection #3 started
2018-12-17 13:15:56 Received sampling focus mask (region 0 0 2560 1440)
2018-12-17 13:16:26 Closing loopback manager
2018-12-17 13:16:26 DR is finished
2018-12-17 13:16:26 Ready for new connection
2018-12-17 13:16:26 Running command:
"C:\Program Files\Autodesk\3ds Max 2018\3dsmaxcmd.exe" "C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\corona_dr.max" -continueOnError -gammaCorrection:1 -rfw:1 -sf -v:5 -postRenderScript:"C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\post.ms"
2018-12-17 13:16:28 Started loopback connection with 3ds max
2018-12-17 13:16:29 Cannot contact 3ds Max, trying again ...
2018-12-17 13:16:29 3dsMax started successfully
2018-12-17 13:16:29 Accepted remote connection from 192.168.2.138
2018-12-17 13:16:29 Started connection #4
2018-12-17 13:16:29 Handshake: <root><DataType>0</DataType><Handshake>init</Handshake><FrameName>0</FrameName><HostVersion>Max2018</HostVersion><CameraName>CoronaCamera002</CameraName><Region>0 0 0 0</Region><ImageSize>2560 1440</ImageSize><MD5>8d4061bcc6ad3c1592a73083d424b08b</MD5><CoreVersion>3</CoreVersion><IpAddress>192.168.2.138</IpAddress></root>
2018-12-17 13:16:29 Saving incoming scene to C:/Users/MERC B2/AppData/Local/CoronaRenderer/DrData/received_scene_2615601153.max
2018-12-17 13:16:29 Downloaded scene: 10 280 960 bytes in 0 s
2018-12-17 13:16:30 Render for connection #4 started
2018-12-17 13:16:30 Received sampling focus mask (region 0 0 2560 1440)
2018-12-17 13:17:00 Closing loopback manager
2018-12-17 13:17:00 DR is finished
2018-12-17 13:17:00 Ready for new connection
2018-12-17 13:17:00 Running command:
"C:\Program Files\Autodesk\3ds Max 2018\3dsmaxcmd.exe" "C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\corona_dr.max" -continueOnError -gammaCorrection:1 -rfw:1 -sf -v:5 -postRenderScript:"C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\post.ms"
2018-12-17 13:17:02 Started loopback connection with 3ds max
2018-12-17 13:17:03 Cannot contact 3ds Max, trying again ...
2018-12-17 13:17:03 3dsMax started successfully
2018-12-17 13:17:03 Accepted remote connection from 192.168.2.138
2018-12-17 13:17:03 Started connection #5
2018-12-17 13:17:03 Handshake: <root><DataType>0</DataType><Handshake>init</Handshake><FrameName>0</FrameName><HostVersion>Max2018</HostVersion><CameraName>CoronaCamera002</CameraName><Region>0 0 0 0</Region><ImageSize>2560 1440</ImageSize><MD5>8d4061bcc6ad3c1592a73083d424b08b</MD5><CoreVersion>3</CoreVersion><IpAddress>192.168.2.138</IpAddress></root>
2018-12-17 13:17:03 Saving incoming scene to C:/Users/MERC B2/AppData/Local/CoronaRenderer/DrData/received_scene_2707054748.max
2018-12-17 13:17:03 Downloaded scene: 10 280 960 bytes in 0 s
2018-12-17 13:17:04 Render for connection #5 started
2018-12-17 13:17:04 Received sampling focus mask (region 0 0 2560 1440)
2018-12-17 13:17:34 Closing loopback manager
2018-12-17 13:17:34 DR is finished
2018-12-17 13:17:34 Ready for new connection
2018-12-17 13:17:34 Running command:
"C:\Program Files\Autodesk\3ds Max 2018\3dsmaxcmd.exe" "C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\corona_dr.max" -continueOnError -gammaCorrection:1 -rfw:1 -sf -v:5 -postRenderScript:"C:\Users\MERC B2\AppData\Local\CoronaRenderer\DrData\post.ms"
2018-12-17 13:17:36 Started loopback connection with 3ds max
2018-12-17 13:17:37 Cannot contact 3ds Max, trying again ...