I did exclude the Dalvik-Cache, no change though. Did not format them yet cuz i don't have time to save all my data in case something goes wrong.
It's okay to format cache and dalvik cache, if you don't want to reinstall and set up apps again, just don't wipe data. In fact I think it would be a good idea when updating the ROM, but it does make for a long first boot.
+1
I am having the same problem, not using ART, with cache and dalvik formatted and with both ROM manager and cwm.
I had this problem in the early days of Android 4.2, I don't restore apps or data since. If I'm not changing the ROM, I just don't format data any more. If there's a big change in the ROM, I reinstall apps from the play store. I find I usually get no app errors this way.
PS. The problems I had in the first couple of days with the stock email client not being able to connect to an exchange account street a few days seems to have disappeared, and hasn't happened at all on the 1218 nightly.