I just updated to latest illustrator, and all of my html panels fail (close immediately or stay blank)
Where should I start looking?
What CSXS version are you using in manifets.xml file?
I am using 7.0
If the version is no longer supported, I would expect the extension to not even show up in the extensions menu
That's correct. Is your extension uses Iframe?
Did you check list of issues in the CEP resources?
it turned out that the extensions now were "unsigned" - I had to add PlayerDebugLevel to the registry for CEP11 as well.
BTW: cookbook says that I should set PlayerDebugLevel for the version referenced in the manifest