The new "content management" can only be accessed if the library palette is undocked... (see the Content Collections tab on top)... You can add any files via right clicking them to the content collections - folders don't seem to work though. But the good news is that it's using regular Windows shortcuts (at least the Windows version ;-)) so one should be able to drop folder shortcuts in there, too, if you feel brave ;-) The multi threaded rendering doesn't seem to be working in a too effective fashion, it's dividing up the image into big blocks first and then rendering each block in a separate thread... So if you're using two threads and one of those threads finished with its part of the image, that thread will idle till the end - so if the top of the image renders in 1 minute and the bottom needs 1 hours you'll have one thread doing nothing for 59 minutes :-(