Almost a copy of my last answer to judithjoan ...
One more thing to try:
- use file manager to copy a DRM book from the computer to the ereader
- then try to read the file from the ereader memory in ADE
- then unplug and try to read the file on the ereader.
If the file manager copy doesn't work, I'm not sure what to suggest.
If the file manager copy does work, looks like something wrong in the ADE DRM file copy mechanism.
In that case, it may be worth trying with the older more reliable ADE1.7.2
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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.
http://helpx.adobe.com/digital-editions/kb/cant-install-digital-editio ns.html
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.