I have installed the plugin Useful 404's that e-mails me the broken links on my website as soon as they appear.
I got the following email:
There is a broken link on page http://***.com/wp-admin/admin.php?page=bwb-photosmash.php
Someone tried to go to http://***.com/wp-content/plugins/photosmash-galleries/css/ui.core..css?ver=1.0
It looks like there is one dot to many...
not resolved