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I was having this exact same problem and deleting options.txt resolved it. I don't know if you want it as well but I'll include it.

options.txt

Windows 8.1
64 bit
8gb Ram
AMD FX(tm)-8320 Eight-Core
NVIDIA GeForce GTX 1050 Ti
log


The other campaigns are working fine, but when I navigate to the Under Games campaign it fails to load the initial screen and goes straight to the overview (the map portion that's segmented into missions). Trying to back out of this causes the game to hang and nothing will be selectable after this forcing me to crash the game to get out of it.


Another user was having similar problems (https://brightrockgames.userecho.com/communities/1/topics/3923-cannot-select-level-in-campaign-menu#) and the solution was found, deleting the options.txt worked.