Ok, so this is quite repeatable for me and only appears to happen in the new UI. I enter a race at Monza (have not tried other tracks yet). 44 AI and session type does not matter. For these tests I have been using practise and qual. On first exit, all is OK. I return to the main menu as expected and replay file is saved. If I load back into the replay, session will resume as normal and no issues. However, if I exit the session (replay saved too automatically) and then quit rFactor from its main menu and head back to windows (just as you would when normally closing down the game), and then load up rFactor again, load the replay of the session again to pickup where I left off.....all is OK when going back into the game. BUT....if I exit this particular session (re-loaded replay AFTER RF2 had been closed), the session will write the replay file as normal, but the game will not exit back to the main menu. Instead it remains on the session UI. Live and replay box go black, timings disappear from the session UI, but all menu items are still clickable from the session UI. Again, the game will not revert back to the main menu. Subsequent load attempts of the same or new replay will give the same results. So, I decided to go to steam and select the "old/previous" stable build (I am not sure which build version this is exactly), which I think has the old UI (White/Red colour scheme). Since using the old UI, I have not been able to reproduce the bug. Each time I have exited a session, it has done so cleanly and without issue. More testing needed, but yeah, it appears to be a session exit bug related to the new UI. Here is one on a plate for you!!