Welcome to the forums and thanks for posting!
The boss health orb issue I swear I thought we fixed in the latest patch. Are you at 220.127.116.11? It was released a few days ago and should have that health orb pick up fix!
There are several stash tabs as well as several bag tabs.
you need to cycle through the first four bag tabs to get to the stash tabs. Are those the ones that will not stay “unlocked” for you?
#3 known issue…will probably be like this for a while still