After upgrading to KDE 4.11.0 some program windows were not visible anymore even though the programs were started correctly. I had KWin rules defined that made Kontact, Kopete and Clementine visible on all activities. After deactivating this Activity rule and reactivating it, the windows showed up as expected. Exporting and re-importing the rules doesn't help. Neitherwill playing around with other settings of the rule (like Desktop etc). You don't have to delete the whole rule. Just deactivating, and after applying the rule reactivating, the Activity setting is enough.
That's because of a change from "ALL" to "00000000-0000-0000-0000-000000000000" for "ALL" activities. A kconfupdate script should have taken care of that (and is confirmed to work correctly), but apparently wasn't run (since you're the second person encountering this)
Created attachment 82642 [details] An exported rule that doesn't work Hope this helps in some way
Yes, the "ALL" statement there is the problem - it's become invalid. It's no surprise that rules that have been exported with "ALL" now fail on re-import, but the present rules should have been updated with the kconf update. We'd rather need to understand why it didn't run after the version update...
Is this bug can be safely closed?
Yeah, it sucks that we had an ID change, but it's too late to migrate stuff now.