Everything was working fine. I don't remember making any changes that I had not tested. Then all of the content from community builder resulted in blank pages. Found there was a memory issue so I increased the memory limit in WHM. Now I am getting an Internal Server Error message. In the admin interface everything is working fine expect for the community builder configuration tab which also has the same message. PHP error log reports the following:

Files are present and have the correct permissions.

There were no changes on the server side. We have not setup any custom 500 error pages. The lines I highlighted in my first post are from the error log not the error pages. I replaced the domain name with XXXXXX.

From the error page.

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@XXXXXXX and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Let me know what you think.

I did that, which is how I found out about the original memory issue. No other error message have been exposed.