I have just updated to ACA 2013 - My tool palettes are dysfunctional at best. I have two seats - on one I get the message "Unable to execute tool. Class not registered" and on the other I get "Unable to execute tool. Not enough storage is available to complete this operation" I have done everything I could find in the forums at Autodesk Subscription - inlcuding 'repair' and 'reinstall.' I am very very frustrated - my work output has slowed to a crawl.