Hi Nikolay, Tests you added in the following commit fail on all platforms. Did you run the tests in Windows? commit d7999a008be5d7e95fcd86019adc79b0359ae8d4 Author: Nikolay Sivov <bunglehead at gmail.com> Date: Tue Jul 8 01:32:36 2008 +0400 gdiplus: GdipInvertMatrix implementation with tests. -- James Hawkins