Diamond-question-marks in Visual Studio

I'm running Visual Studio 2005 for the first time on my new machine (an HP thin client accessing a virtual machine over their HP SAM Client software). When execution halts on an exception, the text for t开发者_StackOverflowhat line appears as below. It appears that it can't find the characters in some font variant or something, but I can't figure it out.

I tried changing the font from Courier New to other ones, and it made no difference. This same character showed up in that alternate font. I wasn't even sure what to try searching for on here or Google with this one.

Update: I'm seeing this in various other places in my code, even at design-time. It definitely appears linked to some specific font attribute, though I haven't been able to tell which.

Update 2: I'm not sure whether this is surprising or not, but copying and pasting the question marks into another application works as though there's no problem.

Update 3: On the same machine, Visual Studio 2008 behaves as expected (that is to say, normally). To provide additional details on VS2005, I'm running version 8.0.5727.42.

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Updating to Visual Studio 2005 SP1 fixed this bug. Our default installation is an outdated version.