[Stk] Stream underflow errors on Windows

[Matt Day]

I suspect this may be a common issue although my searches did not reveal 
any discussion of it. Apologies if I have missed something.

When building applications under Windows that use full-duplex realtime 
audio, I always see stream underflow errors which result in 
discontinuities in the output audio. I have tried increasing the buffer 
size, and this usually reduces how often it occurs, but it will still 
invariably occur once. The issue can be seen just by building and 
running the duplex example under the free version of Visual Studio. I 
have run this example on 3 different machines and all three exhibit the 
issue (either running WinXP or WinXP x64 edition).

I would be most grateful if anyone can point me to any information on 
the issue and why it might occur.

Many thanks,
Matt