Sorry, Peter, this is the first I've heard of anyone having this difficulty -- and, from the screenshot, the first time I've ever seen a an error like this on any web page.
Since it happens to you only occasionally, I can be pretty sure it's not the code, which is static. The exact same HTML is called up each time you load the page. One of the platforms I test pages on is IE5, as well.
As far as highlighting text changing the background color, I'm not sure I follow you... if you highlight text on any web page, the background behind the text changes color. This is typified by the highlighted text in your image.



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