I have not used the CBS app in a long time but I tried it tonight to see if I experienced your problem.
I can't get the CBS app to load here at all. It tries to load then just returns to the Roku home page channel grid. Remove/Restart/Reload has made no difference, which should indicate I have a clean install of the latest version. I have CBS Version 7.7, build 20220928.
I received Roku OS version 11.5 just yesterday. It may be that CBS needs to update their app to be compatible with Roku 11.5.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X