try to reopen the module in the admin area and reset the 'tags' settings for each item and resave.
this is a reported issue and should get addressed in the next roksprocket release, the workaround i mentioned should remove the errors from frontend.
Warning: Invalid argument supplied for foreach() in /home6/finalweb/public_html/components/com_roksprocket/layouts/mosaic/RokSprocket_Layout_Mosaic.php on line 106
RokSprocket 2.1.1
Robox 2.0.7
Hadron Joomla Template - Version 1.1
PHP Version 5.4.27
joomla 3.3.0
we do have a fix which is still waiting for the release.
until then, please download the attached .zip file and unpack it and use the file inside to replace the existing file under:
../components/com_roksprocket/layouts/mosaic/RokSprocket_Layout_Mosaic.php