Bug:
When SEF is enabled, some buttons submit to pages that return "Unable to load main template". This may also keep polls from being created.
Fix:
Find in smf.php:
$nqsefurl = substr($nonsefurl, 0, strpos($nonsefurl, 'option')) . preg_replace('/(\;)([^=#]*)([#"])/', '$1$2=$2$3', substr($nonsefurl, strpos($nonsefurl, 'option'), strlen($nonsefurl)));
Replace with:
$nqsefurl = substr($nonsefurl, 0, strpos($nonsefurl, 'option')) . preg_replace('/(\;)([^=#]*)([\;#"])/', '$1$2=$2$3', substr($nonsefurl, strpos($nonsefurl, 'option'), strlen($nonsefurl)));