Application using a DLL, but Visual Studio 2010 not showing it in Modules window

Application using a DLL, but Visual Studio 2010 not showing it in Modules
window

I feel like this is a stupid question, but I can't seem to figure out the
answer. I've currently got a C++ application that's loading & utilizing a
DLL (I compiled both the application & the DLL with VS 2010). I'm positive
it's using the DLL, because a) if I rename the DLL, I get a not found
exception, and b) it's displaying output that only comes from (and I can
change it to see the output change) inside the DLL.
My problem is that in Visual Studio's Modules window while debugging, the
DLL does not appear to be loaded. Because of this, obviously its got no
symbols and I can't set breakpoints... But this doesn't make any sense to
me as it's clearly using the DLL.
I've seen several other similar questions, and the answer has generally
been too look at whether the code is native, managed, or mixed, and set
the "Attach to Process" field accordingly. I've tried all the options
there, and made sure my Debugger Type is set to "Mixed" (though I've tried
it with Native & Managed as well, just to verify none of these solve the
issue).
Does anyone have any suggestions?
Thanks in advance!