On the two DO12 test installation I have a GUI related issue, whenever a tab opened that did not load the (network) location because of my settings.
I mean these type of messages:
The issue I see cannot be captured in a screenshot for some unknown reason, I needed to pull a digital camera to catch this:
I guess you can see the leftover line or border from that message after switching to another tab, right above the mouse cursor.
I can have multiple of these and they are sticky in length and position. If I resize the window or filedisplay and switch back to a tab showing such a message, DO will create even more of these lines, which then do not dissappear. Well, they do at some point in time, but I was not able to find out when and why yet.