Can't Run Older Projects In 2.80B5

I just downloaded the last Beta-Release 2.805b and tried to run some of my renoise projects I made with 2.7. But it doesn’t work. It allways started with the wrong bpm. Also when I changed it the song runs out of time. Maybe it’s because I switch between Win XP and Ubuntu. But I never got problems doing it while using 2.7. Maybe it’s a bug that will be fixed with the first alpha release. I don’t know. Anybody here that got the same problem?

Don’t know, but something with the BPM automation controls on the master channel was fixed with B5 (prevent from crashing) maybe something else got unawarely touched?