Hi again,
I have an update, it looks like somehow a setting got messed up in one of the config files. If you follow the following steps it should start to work;
1) Close Max
2) Open the following file in notepad: %localappdata%/Autodesk/3dsMax/2018 - 64bit/ENU/en-US/plugcfg/corona/SystemSettings-3154687.conf
3) Find system.enableBitmapModificationChecks
and change it from false
to true
4) Save the file and reload Max
This might get reset to false from time to time, but we are working on a fix so this doesn't happen in the future.
Thanks,
Rowan