An error occured or the request was stopped.
And then this error changes to this
Parse error: syntax error, unexpected '<' in C:\Winginx\home\xen\library\XenForo\Template\Compiler\Lexer.php on line 1275
Of course I haven't touched any core files, so I have no idea where the unexpected '<' came from. Strange is that nothing was recorded in the server error log. I have restarted Winginx but the error persisted. Any other ideas?