I have a Mac with OS X 10.10.2 (Yosemite). I am running Digital Editions 4.0.3. The same problem also happened on Digital editions 4.0.2.
I have signed into Digital editions with my Adobe ID and can see all of my books (I migrated from a PC). However, I cannot open any new borrowed (library) epub books in digital editons. The error message I get is Error getting License. License Server Communication Problem: E_ACT_NOT_READY
I have tried signing out of digital editions. In the older (4.0.2_ version I was able to do this, sign back in again, but still had the same problem (same error message). In the newer digital editions when I try to erase authorization information, I get the error message Unable to erase authorization information. Please try again after some time.
I am pretty sure this a mac-only problem as it works perfectly well and I am able to add borrowed books etc on my PC. I am new to mac so maybe I am missing something obvious....but from reading other things it seems like this is a long-standing issue. Any help?