Hi Dragos,
thanks for your reply. I followed the steps above and did not get any errors when using the debug mode. Disabling plugins/themes/add-ons also did not resolve the problem.
However, the error message on the white screen changed. It now says:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator at [email protected] to inform them of the time this error occurred, and the actions you performed just before this error. More information about this error may be available in the server error log.
Best regards,
Matthias