[Thu Feb 18 16:40:44 2010] [error] [client 79.27.105.179] PHP Warning: Unexpected character in input: ''' (ASCII=39) state=1 in /vhosts/*.com/httpdocs/cache/joomsef.cache on line 1730, referer:
forum.*.com/showthread.php?t=49888
[Thu Feb 18 16:40:44 2010] [error] [client 79.27.105.179] PHP Parse error: syntax error, unexpected $end, expecting ']' in /vhosts/*.com/httpdocs/cache/joomsef.cache on line 1730, referer:
forum.*.com/showthread.php?t=49888
Maybe this report will help you to find the problem, which is related to missing or erratic escaping of some characters.
Of course, the latest version is installed.