MAX 2016. I had Corona menu at the top of the bar, and everything worked like a charm.
Just before 10 min. I've installed RC 1.7 and Corona menu is missing, then I found it in Customise menu and put it back again, but then I got an empty box.
PS: I have noticed another strange thing. RC is installed but Corona showing the Daily from 15th.
It looks like your installation got somehow corrupted. The new build correctly identifies itself as RC1. Please try:
1. Uninstalling Corona
2. Removing manually all Corona files from 3ds max root folder and plugins subfolder (all our files have "corona" in their filename). It should be these files:
a) Corona_maxHairFur.dll
b) Corona_Release.dll
c) CoronaLib_Release.dll
d) CoronaOpenExr2-v140-x64-Release.dll
e) wxmsw310u_vc_corona.dll
f) plugins/Corona<version>.dll
g) plugins/CoronaUtils<version>.dll
3. Removing the whole Corona folder in program files
4. Installing RC1 again
Anytime the Corona menu is screwed up, you can reinitialize it by deleting file %localappdata%\Autodesk\3dsMax\<version> - 64bit\ENU\en-US\plugcfg\CoronaRendererMenus.ini