Definitely a bug. Please report. It might be worth it to check if you can reproduce it from a clean installation. If you can't it may be very hard to fix it.
Hm... Today I just logged in the admin interface, and the problem was misteriously gone. I can change the classes freely again. There were no changes to the sistem in the meantime.
Do I still report this as a BUG?
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Nothing is impossible. Not if you can imagine it!
Sometimes weird behaviour appears during dev and goes away the next day... most prolly related to sessions. Did you try to clear all cache when the problem was there ?
Yep I tried clearing the cache several times, from the admin interface, using clearcache.sh, and also manually deleting the cache folder. But nothing happened. Only after a day (during which I did nothing) the problem disappeared. ???
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Nothing is impossible. Not if you can imagine it!
The same stuff happened to me due to _ I think _ session stuff... next time it happens (I'm not wishing any bad stuff to you ^^), try killing the session from Setup/Sessions... it's as far as I know the only place after cache where stuff is stored.
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