PHP 4.3.2 Compatability

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Seems like something has changed in PHP 4.3.2 with sessions. I get the dreded Cart is empty problem.

Setup as follows ... 

Complete fresh install of 2.2 snapshot 25th May 2003. No modifications made at all. 

PHP Version 4.3.2RC4 
System Linux 2.4.20-13.9 
Server API Apache 2.0 Handler 
RegisterGlobals = ON 

MySQL Server 4.0.13 
MySQL Client API version 4.0.13 

When going to checkout I am told Cart is empty! 

Any ideas where should I begin to look to find what needs to be changed to get osc working with 4.3.2 ? 
I tried changing all $HTTP superglobals as suggested in another thread but no change.