anyone else having problems with imported PDFs?

I have been a happy user of Scrivener for a very long time, and have always been impressed with its stability–until this week. I’m using Scrivener 2.6 on a mid-2012 MacBook Pro, running Yosemite (10.10), and even since the switch to Yosemite a few months ago, it’s been fine. What’s happening now, though, is that I have a lot of PDFs in one Scrivener project, and now when I try to read any of them Scrivener crashes. ( I sent the crash logs in the first two times, and then I stopped. )

I’ve also stopped adding PDFs, but just now I was trying to read an older one, and although it didn’t crash, I was unable to switch that pane of the editor to anything else. Fortunately, I had two panes open, so I switched to the other one, then to a one-pane view, thus closing the troublesome PDF. But it seems as though the problems are growing. Is it possible that I have too many PDFs in the project–is there an effective limit? Right now I have 17; they’re all journal articles, so roughly the same size.

Any ideas? I haven’t actually lost any work yet, but the possibility is making me very nervous.

Thanks,
HD

Sorry: I thought I had searched thoroughly in the forums before posting, but in fact I missed the relevant thread (“PDF trouble”). Since I also use DevonThink, and since I also have the possibility of opening PDFs in a different application from within Scrivener (hadn’t realized that till I read this thread), I have many ways of dealing with PDFs other than shoving them all into Scrivener, and I will make use of the alternatives until a fix is found.