Managing uploads thru WYSIWYG, a bug? Or moi?

Adding a link using the WYSIWYG for a content field, I used the browse function to successfully upload an image file. However, after upload, clicking the "delete" link (in the same popup window) resulted in this error message (only the username and domain_name is changed below):
_______________________
Error:
Notice: Undefined index: num in
/home/username/public_html/domain_name/lib/menus/default/actionHandler.php
on line 161.

Notice: Undefined index: preSaveTempIde in
/home/username/public_html/domain_name/lib/menus/default/actionHandler.php
on line 162
No value specified for 'num' or 'preSaveTempId'!
_________________________

I just betcha this isn't CMS Builder, but TinyMCE, but wanted to report this in case there's something we can do about it before delivering site to client. Any ideas?

Thanks so much.