Pretty much sums it up in the topic title.
I have 2 projects open right now and I expand a set of divs in the HTML so I can click a specific line of code to compare it to an older version of the same site. Open the older version's project and I open all the same divs in the HTML. Swap back to the other project and all the divs I just opened close back up. This happens back and forth continuously, they won't remain open.
Adding on to this, this is very frustrating because not only does it close all the divs you opened, but it also refocuses your selected div to the parent div of the area you were in so you can't even do a good comparison, because you can't keep the focus on the div or line you are trying to compare lol. Maddening I tell you! :P