Olly. When I run Aven I get this error, I run Windows XP. Fatal error: Mismatch between the program and library build versions detected. The library used 3.0 (wchar_t,compiler with C++ABI 1011, wx containers, compatible with 2.8), and your program used 3.0 (wchar_t,compiler with C++ABI 1013, wx containers, compatible with 2.8), Brian.