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Internal Server Error with PHP 5.5+

EliaGa

New Pleskian
Hello everybody,
on my Plesk 12, choosing Php version 5.5 or 5.6 in hosting settings, I have an Internal Server Error page.
I tried to reinstall them from "add and remove" page, but problems persist.
Have you got ideas?
Thank you
 
Not enough detail. Need more information. Error messages from logs, etc.
 
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