2.3.6 and PHP 5.2.6

[Kimmo]

We are upgrading our forums to the latest versions during next week, at the moment we have version 2.3.6. We have 3 dedicated servers and we told our host to upgrade those to the PHP and MySql versions that latest IPB requires.

They did and immediately after that we 'lost' our forum. I mean that if you went to the forum, all you could see was a blank page, forum was 'invisible'. Our host said, that they put PHP version 5.2.6 to the server and that collapsed our forum. As I wanted forum to work and we'll upgrade it only during the next week, I asked them to put old PHP version back. They did and now forum is working again.

So the question is, that is IPB 2.3.6 incompatible with PHP 5.2.6? If yes, does new IPB 3.0.5 work with it? If PHP 5.2.6 should work with 2.3.6, what could cause this all?

BW

Kimmo

PS: I have sent ticket to IPB but as it is weekend, they'll probably not answer it and I'd like to know if there is something to do earlier.