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Provided you properly credit the authors of the code you use, which you should be doing anyway, how do you run into problems by using BSD'd code in GPL'd code?

Like I said, copy and paste BSD code into your GPL code, and you run into the same problem.

> Provided you properly credit the authors of the code you use, which you should be doing anyway,

Exactly. Even the BSD license has provisions which you must do or you don't have the rights.

I'm not suggesting these rights aren't onerous or difficult to comply with. Rather, you can't just lift BSD code without following the license.