Getting undefined index and other errors in CB

On many of the CB menus in both front-end and back-end, I am seeing these errors:

Notice: Undefined index: 521 in /home/calsail/csc/administrator/components/com_comprofiler/plugin.class.php on line 574

Notice: Trying to get property of non-object in /home/calsail/csc/administrator/components/com_comprofiler/plugin.class.php on line 574

And some functions are not working at all. For example, if I try to edit a user in CB, I can make the changes, but neither the Save nor the Cancel button work.

I thought of reinstalling CB, but I couldn't find instructions on how to do it.

Ensure the Default template within CB > Plugin Management is enabled and public. That could also mean you've a plugin being called that isn't enabled. Check that CB Core is public and published. Next review your other installed plugins and enable/disable them 1 by 1 until the issue resolves.

I noticed another admin has two plugins checked out: CBSubs SQL actions and
CBSubs Folder Access--can this affect CB's performance?

I disabled each of the CB plugins in turn, and the problem did not go away.

Would reinstalling CB be worth a try? If so, how do I do that?

petekuhn wrote: I noticed another admin has two plugins checked out: CBSubs SQL actions and
CBSubs Folder Access--can this affect CB's performance?

Nope - this does not affect performance.

petekuhn wrote: I disabled each of the CB plugins in turn, and the problem did not go away.

Would reinstalling CB be worth a try? If so, how do I do that?

Please provide a list of all your CB Plugins here so we can perhaps guess the culprit.