I've been noticing the same things, and still trying to figure out where it happens. It has most likely to do with returning-by-reference in the wrong places.
It's also not very easy to reproduce the problem - I already spoke to several people including the guys that wrote zend, but they don't seem interested in fixing it for PHP 4.
I've downgraded to PHP 4.3.5 and it works ok. I tried 4.3.6 ... 4.3.11-dev with no luck.
Now, I'll have to figure out how to apply security patches for later versions to 4.3.5
thanks
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