mb_ereg() and mg_ereg_replace() errors in phpMyAdmin

[phorium]

With the CSS issues in the Plesk version of phpMyAdmin, (see this thread: http://forum.sw-soft.com/showthread.php?s=&threadid=20024) I installed my own version so I could still use the application. However, when logging in as a user I see the following errors:

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Warning: mb_ereg(): mbregex compile err: premature end of regular expression in /home/httpd/vhosts/mydomain.com/httpsdocs/phpMyAdmin-2.6.0-pl3/main.php on line 245

Warning: mb_ereg_replace(): mbregex compile err: premature end of regular expression in /home/httpd/vhosts/mydomain.com/httpsdocs/phpMyAdmin-2.6.0-pl3/main.php on line 247

Warning: mb_ereg_replace(): mbregex compile err: premature end of regular expression in /home/httpd/vhosts/mydomain.com/httpsdocs/phpMyAdmin-2.6.0-pl3/main.php on line 249

Warning: mb_ereg_replace(): mbregex compile err: premature end of regular expression in /home/httpd/vhosts/mydomain.com/httpsdocs/phpMyAdmin-2.6.0-pl3/main.php on line 249

Warning: mb_ereg_replace(): mbregex compile err: premature end of regular expression in /home/httpd/vhosts/mydomain.com/httpsdocs/phpMyAdmin-2.6.0-pl3/main.php on line 250

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These errors only show up when logging in as a user - not as an admin.

Any ideas what could cause this?

Thanks!