php 5.2.0 update problem

[linksys]

I have found something interesting:

http://drupal.org/node/61900

Hey DrByte, I think the above link likely addresses the same issue here. Look at the "Finally Tracked This Down" part and the "Problem Background" part:

Finally Tracked This Down

This is a bug PHP's behavior with global variables. I have a simplified test case which shows the problem in operation and offers a fix.

This has been hard to resolve - this "login issue" can manifest itself from other bugs that involve session ID's and cookies. This is yet another issue.