panel not at top after debian upgrade
I have upgraded my debian from jessie to buster, and my panel is not anymore on top. Here is a screenshot of the top left corner:
As my upgrade broke many things, I have reinstalled my system from scratch, keeping only
/home. The result is the same. I have tried to put the panel vertical and back to horizontal, nothing changed. I don't see anything in the configuration of the panel that can help me.
How can I solve this problem please?