Been working ok for hours, but suddenly threw a STL exception from the boost service code. None of my code was on the stack that crashed; it seems to be the thread that handles the TCP connection to the tracker server.
Here is a crash dump, including exe, pdb symbols, and (though not needed) my source for the client app. I did not include boost; but it was built with 1_55_0 in VS2012 debug. https://www.dropbox.com/s/6pt6hzp4chgmzkm/subscript_out_of_range.zip
I imagine the developer who wrote the library code could troubleshoot this way faster than me. If it starts happening to me more often I'll try to puzzle through it myself.