Looking through error logs on one site I see an entry that concerns me. Only this IP has this error but it is apparently the Google bot. What may help is I have a custom theme. I don't use Prosilver
[Sun Jan 19 14:41:48 2014] [error] [client 66.249.64.24] PHP Parse error: syntax error, unexpected T_STRING, expecting ']' in /mnt/glusterfs/apache/hosting-dir/110/user_dir//cache/tpl_prosilver_viewtopic_body.html.php on line 36
(yes, I know I have to upgrade but the site is running a script that may noy be compatible. Will find out after I submit this)