Hi! The appearance of the unused or deselected workspace is strange, cause all the windows border are painted and this is not very clear when some windows are at same time in the virtual desktop. Here, the appearance of the selected workspace and deselected but mouse hover workspace: https://imgur.com/jxXynli.png And here the common appearance: https://imgur.com/WxOrm0L.png Notice the third workspace (the right one) is a mess of lines with only one rss feed icon. Thanks a lot!!!
That looks like bug 15690. Maybe the fix is incomplete.
*** This bug has been marked as a duplicate of bug 15690 ***