I am trying to use the circular_buffer template from Boost (version 1.35.0) with VS 2008 (msvc-9.0). I initially downloaded the compiled libraries from boostconsulting. However when I linked against them, I got a link error that (__imp___wassert not found )whenever I used an iterator. A search on the web revealed this problem seems to occur when the version of MSVC used to compile is different from the one used to link. I then decided to do a local compile using the basic bjam command with the toolset pointing to msvc-9.0. However I still get the same error; I have confirmed that VS is picking up boost libraries from the locally compiled location. The error does not happen in the Release mode. For the time being I am working around the problem by disabling assertion via a compile time flag which forces all boost asserts to (void)0. I will appreciate any thoughts on how to overcome this problem without disabling asserts. -Vikram