I second this. I just downloaded ADE to my Macbook Pro with OS X 10.9.5. After downloading a book to ADE, ADE "Quit Unexpectedly..." I reopened ADE and tried to open the book that I downloaded, but again, ADE "Quit Unexpectedly..." Over and over and over again.
What's up with that?
Will somebody at Adobe please answer this question? I am also having the same issue. Thank you.
has anyone already received a solution from adobe. i have the same problem en it is driving me crazy.
I am seeing the same, since updating to Yosemite trying to sync a book to a Kobo results in a quit unexpectadly error, this was a clean install of the OS so ADE 4 was installed fresh.
Maybe this is a variant of the problem being reported above? I am using a MacBook Pro with ADE 4.0 and Mac OSX 10.9.5 and this problem is happening on some but not all (or even most) books.
When I download from the library, the book automatically opens in ADE. Some books will cause ADE to "quit unexpectedly" when the book is opened, these tend to be those with many illustrations (e.g. Hollow City by Ransom Riggs, Bible Heroes by Christin Ditchfield). But even so, the epub file does download successfully, ADE crashes when it opens the ebook file. Also crashes if I open it at a later time.
I am able to read these books with other readers. So they are downloaded. ADE crashing is a pain and involves extra steps to be able to read the files. It may be an Adobe DRM problem. As an experiment, I can make a copy of the ebook and remove the DRM and copy it back to ADE, then it works fine.
ADOBE -- you need to fix this in ADE!
Here's the first part of the crash report.
Process: Adobe Digital Editions  Path: /Applications/Adobe Digital Editions 4.0.app/Contents/MacOS/Adobe Digital Editions Identifier: com.adobe.adobedigitaleditions.app Version: 4.0 (1) Code Type: X86-64 (Native)
Parent Process: launchd 
Responsible: Adobe Digital Editions  User ID: 501 Date/Time: 2014-10-25 12:01:29.396 -0700 OS Version: Mac OS X 10.9.5 (13F34)
Report Version: 11
Anonymous UUID: 6CE2DBB5-3021-527C-4322-369D5847D5AC
Sleep/Wake UUID: BC05E6DB-8045-4C29-839A-B0A20A97C2CE
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
[The rest is too long to include here]