I upgraded to this new OS version, restored from backup and reinstalled applications. As last app I installed CPU/Mem/Screenshot applet .
After the final reboot (there were a couple in between, just to make sure) everything loaded as expected, but when attempting to connect to my WLAN, the machine "gasped" and rebooted. Tried again, same result. Since above mentioned app was the last one installed, I uninstalled it and rebooted. Now everything works OK. Weird.