Since going to the beta 2 I have had zero issues with anything except one app still won't open but considering all the issues I was having in beta 1 I can deal with the one app not working correctly it almost feels like a final build for me and I really like the look and feel of one ui 6
One thing to consider is that possibly the beta doesn't meet the apps api level or vise versa which would cause it to not work. If you tried uninstalling and reinstalling with same results, kind of sounds like an api issue.
MarvinMod2 is correct and some apps like banking apps do not like to work on beta firmware because it's not considered a certified operating system. When the firmware is final and official firmware then they work correctly.
