Just upgraded to 3.5.1.
Don’t know if this was happening in an earlier version, but I just tried to go to the Add-On Manager and received the following error message:
Fatal error: Class ‘Query_upd’ not found in /xxxxx/xxxxxxxx/public_html/xxxxxxxxxxxxxxxx/xxxxxx/ee/EllisLab/ExpressionEngine/Controller/Addons/Addons.php on line 1193
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