Another thread here solved a lot of my out-of-sync problems (thanks!) but I have a few devices still giving me a headache. Removing and re-adding them to RME doesn't help, I still get 2 kinds of problems with my 3020 blade switches. "Startup config not available" and a config mismatch on the lines describing "ntp clock-period" (value mismatch) and "certificate self-signed 01 nvram:IOS-Self-Sig#3801.cer" in running but " certificate self-signed 01" in start-up.
I downloaded and installed all devices from cisco.com so I think I should have support for all that there is.