When I try to use the timelines this is what I get:
When I try to use the "-, Fit, or +" buttons the app unexpectedly quits.
I have been talking to logos about the same issue. I contacted customer service because my MacBook listed only three of the eight timelines that I should have in my library. (But all eight were listed as available on my iMac.) Then I noticed that all my timelines malfunctioned in the same was as your screenshot. And sometimes, not always, utilizing the resize options causes a crash. My contact was with customer service/support by phone then email. It has been passed on to the devs, so hopefully there will be resolution soon.
Same for me. Used to work correctly before with previous beta versions.