Got the same problem. Can't download some eBooks. Importantly can't open books from British Library - the only reason I've installed the program.
Also it keeps crashing when closed which may be related.
Problem Event Name: APPCRASH
Application Name: digitaleditions.exe
Application Version: 9.0.1085.27
Application Timestamp: 49da78f3
Fault Module Name: rapistub.dll_unloaded
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 465eef68
Exception Code: c0000005
Exception Offset: 6bec4e00
OS Version: 6.0.6001.2.1.0.256.6
Locale ID: 2057
Additional Information 1: b2be
Additional Information 2: 82109204b3973566ace818217390e302
Additional Information 3: 36f3
Additional Information 4: 99a6b5c0b5c2bf4e8631028c821216b6
As someone mentioned here, RAPI seems to be part of Microsoft Acitve Sync.
I have exactly the same problem. Was able to download Alice in Wonderland and Geography of Bliss from the sample library but not Sherlock Holmes.
I too need to read documents from the British Library which of course don't work. I have wasted a lot of time on this stupid application, should have just got on the train and visited the library in person.
I have just noticed that that the sucessfully downloaded books are stored in a folder in the computers administrator account; in Admin > Documents > My Digital Editions. Surely this is not right. Explains why the bloody thing is always asking for an administrator password.
I found a workaround in this thread: http://forums.adobe.com/thread/445354
I have to download instead of directy opening the ascm files, but the downloads work. This blocking "feature" of Vista is something I hadn't seen seen before, I had no info about it.