ADE 2.0 only has text in the top nav: File/library/help.
All other text is shown as box icons and unreadable. The edit nav (in document) has no working drop-down links.
I have deinstalled and reinstalled ADE 2.0 twice more. No change.
I have been able to read an acsm document but when I try and see the same acsm format in a document from the British Library, it will not load into ADE.
What is the error message when you try the British Library .acsm file?
It could be that the file is already associated with somebody else's ID?
You may find the old version works better for you (see below).
There are fewer bugs in the old version, but the user interface is even more non-standard than for the new one.
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.