08-29-2014, 08:46 PM
Put a breakpoint to the line producing the warning (src/Chunk.cpp, line 1112) and run under MSVC, the debugger should hit that breakpoint and you should be able to see the callstack. You can actually select everything in the callstack window and copy-paste it here as text; but you could also investigate as to why is the function called with Y set to -1.