Hi,
for the symptoms described, this is probably a license file corruption.
To solve the problem you need to delete the license file adskflex_00691b00_tsf.data which will force you to re-authorize the products again.
The license file location depends of the OS.
Windows XP > C:\Documents and Settings\All Users\Application Data\FLEXnet\adskflex_00691b00_tsf.data
or
Windows Vista/Seven > C:\ProgramData\FLEXnet\adskflex_00691b00_tsf.data
---------------------------------------------------------------------------------------
If my post answers your question, please mark it as an Accepted Solution, so that others can find answers quickly!
For more tips & tricks:
http://upandready.typepad.com
Antonio Barroca
Product Support Specialist
Autodesk, Inc.