Weird series of problems with Digital Editions

Now, this is a weird series of issues.  At first, it would not let me authorise my personal PC I'm working on, because I could only authorise THE ONE I USED FIRST (my office's)... which I found senseless since I can authorise 6 devices, according to Adobe itself.  Randonly enough, finaly a few hours ago, ADE let me authorise it, then it opened the DRM ebook as it usually did some weeks ago.  I closed de app.  Later, I tried to open it, then again, random problems: a white screen; any DRM ebook won't open, or would do randomly, then not.  But last problems: only some hours ago, at least I could open any other EPUB (without DRM). 

But lately I just tried to, ADE just crashed. Touching any menu except Help would make it crash, too. I've been testing it because I work in a library and a reader asked for help. I thought that digital lending has been just a little bit hard for her to handle, so I've made some tests. And I just realize (because weeks ago, it was all fine) ADE it's now filled with so many different problems.When it's not crashing, ADE just stays in a white screen. If I try to open a DRM ebook, I get a message about I already have this item in my library (which is all white, showing nothing at all). If I try to click most of the menus, it crashes again.Yes, I've already uninstalled it and installed it again.