Server Error - when trying to edit/add links

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Whenever I try to edit or add a new html link, I'm getting the error

500 Server Error

A misconfiguration on the server caused a hiccup. Check the server logs, fix the problem, then try again. URL: .../paideia/updates/concrete5.5.1/concrete/js/tiny_mce/plugins/advlink

I'm pretty new at this and not sure where to look.

We're running on Bluehost with Concrete5 v.5.5.1

 
rondadams replied on at Permalink Best Answer Reply
After months of fighting with this, I found the problem. It appears to have been caused by a recent update to C5 that corrupted SITE.PHP, and added the following line at the end:
<?php ?><?php ?><?php define('DIRNAME_APP_UPDATED', 'concrete5.5.1');?>


This was apparently causing the core pathname to be misdirected to the update folder instead of the current working folder when loading.