!heap -s not showing growing heaps in windbg

I 开发者_StackOverflow社区have written an application that is leaking memory - I've done the following in the past

1. find the heap that's leaking with !heap -s

2. inspect the heap with !heap -stat -h

3. see the callstack for the allocation with !heap -p -a

to get the callstacks I add +ust to gflags

while I've done this in the past with great success, !heap -s isnt showing any growth today? I have no idea whats wrong?

it's like my allocations are in a heap hidden from !heap -s?

ideas? I'm compiling (both x86 and x64) using Visual Studio 2010 pro. Using windbg to debug

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the punchline - when allocations are <1MB (default) they go to HeapAlloc(), when they're bigger than 1MB they go to VirtualAlloc instead

VirtualAlloc doesnt appear with !heap -s