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It may be worth replacing ADE 2.0 with the older but more reliable ADE1.7.2.
(Won't work if the book is authorized with a vendor ID rather than with your standard Adobe ID).
There are lots of bugs in ADE2.0 (and 2.0.1). Try replacing ADE2.0 with the older but more reliable v1.7.2.
(You can have them both installed at once if you like.)
Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
The forum software is sometimes corrupting the link above. There shouldn't be a blank in 'editio ns.html'. The following redirects to the same page: http://tinyurl.com/diged172
Some people have found ADE trying to upgrade automatically.
It appears (not 100% sure) that if you install ADE2.0 as a new install (not as an upgrade) that your 1.7.2 will continue to run.
Probably best to say no if 2.0.x installation asks if you want to migrate your library.
If even that fails, I suggest you resort to DRM stripping using a program such as epubee.
It may run on Mac, or you may need to run it on a Windows machine, or there may be a Mac alternative.
I do NOT advocate using such code to get around the valid limitations placed on a DRM book.
However, where the problem arises only because of the ineptness of Adobe's ADEPT DRM infrastructure and its implementation,
such a measure is totally justifiable.
No, ADE 1.7.2 did not work either. But thanks for the idea of DRM removal. Unfortunately epubee is not available for Mac. But I am looking at purchasing another professional one.
BTW, I saw almost an identical query about a year ago on ADE forum. Such a sorry state of affairs at Adobe DRM !