Hmmm, I am having the same exact problem. It was working fine and nothing was changed. Just stopped working.
PHP 4.3.1 in Win2K. Reboot did nothing. Saw in the PHP 4.3.2 release notes that was a memory corruption issue with fopen and urls that was fixed. Upgraded and still have the same problem.
Seems kinda strange that more than one person would have the same problem occur about the same time ??
Would love some insight from anyone else...
Cheers!