lost Desktop after changed to Aria

[Maurizio Marini]

I have lost my son's Fedora 22 :(
I did the insane step to change Desktop theme from 
Fedora twenty two
to Aria
to have a feel of its usability, I logout after change.
Cursor stopped on right corner.
I shut down the notebook with power taste.
When back, after login, I have "Plasma" on menu bar, nothing is clickable,
Desktop is black, manu bar is all right but I can't click on it.
I can only Ctrl-F2 to go to shell.
I see by top that plasmshell is consumng 100% of cpu.
Can I change back to Desktop Theme using some configuration file?
Many thnx
-m
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