500 Internal Server Error... browser-specific?
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It is my understanding that a response code of 500 means that the server encountered an error, possibly a misconfiguration or a timeout.

On my current project I've been getting a lot of intermittent 500-responses (about one in every 100 pageloads). But only in Internet Explorer.

What could possibly cause this? The error is apparently completely random. The best we can get from the logs is:

> [Tue Jul 24 18:57:09 2012] [error] [client 66.83.159.2] Handler for (null) returned invalid result code 70007

I'm using Apache2.2 and PHP5.4.5.