Had an issue with not being able to create loop or punch points in a certain project. Had V-Vocal open on a vocal track and thought this may have something to do with it so I opened a different project and tried to create loop points and it didn't work there either. Is there a problem with Sonar at this point? Anybody experience this or anything like it?
 
Sonar 8.5.3  W7

No such problems here. Can you provide steps to reproduce?

Activate punch recording, enter time in box/scroll to time (doesn't matter), hit enter and the time reverts back to a seemingly random number. Responds the same if I do this from the transport drop down menu. Same thing happens when working with loop functions.