Rush bugs

Having troubles with mobile version of rush.

I have a 50 second clip with a few cuts. When I add transitions to the cuts, playback and export glitch out, adding frames from different segments where they don't belong and sometimes freeze framing or looping sections in playback. Also, after I first open a project and it asks if I want to import more content, all video is blank, forcing me to go back to the home screen and then reopen my project, then it's all there.

Also, why can I not resize a clip from it's start unless I separate it in another layer?

And can I customize the video thumbnail?

I pay rent to adobe to use their apps and support improvements. They've been making visual editing programs for a long time and would think these basic features would be impecable by now... unless they Rushed to get it out.