4.3.9 has security flaws...at least upgrade to 4.4.2.
Also, there is no problems between PHP 4/5 on vBulletin. The PHP devs did extremely well when they released PHP 5 as to not break functionality. 99% of scripts work out of the box from PHP 4 to PHP 5.
Paul M: Why wouldn't you recommend PHP 5.1? PHP 5 sucks, but PHP 5.1 works wonderfully. I've used it on production sites for quite a while with no problems.
Ew, Plesk.
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