thanks a lot for your suggestions.
removed the old authorization, raestarted and authorized again. gave up on waiting for authorization after watching the green bar run for 2 hours.
unistalled ADE 2.o
Installed ADE 1.7.2. but couldnt get it installed at all
uninstalled ADE 1.7.2 and installed ADE 2.o again
tried to authorize and get the message that ADE can not connect to the server make sure that your internet is connected (which it is)
am totally frustrated with this bs and dont understand how this happens after weeks of working fine and without trouble
hate adobe and all the e-book-shops that force me to loose time with all this **** in order to be able to read their books
hate amazon's kindle but at least their system seems to work without problem
anyway... thanks again sjpt it was worth a try