One Use Master ???

Good night, need some help. I've been using roll20 since few months, and since the last two games I've mastered a session, the first time I try to "use" any item (character, handout, folder, image, etc.) I use it normally, I can edit, move or whatever, but once I save changes, here's the problem, I CAN'T USE IT ANYMORE, unless I check out and Log In again as GM...any clue what's going on? I use Google Chrome v. 88.0.4324.182   Thank you so much.

Are you popping everything out in its own window?  If so, then you are running into a bug introduced by a Chrome update.  Either leave things embedded in the vtt (turn off the auto pop out option in your settings) and minimize them to get them out of the way, or use Firefox.