Hi Cygwin, Many .Net programs that use to run correctly from a cygwin 1.7.9 console started throwing exceptions after updating to versions 1.7.10/1.7.11. I have noticed this problem on machines running Windows XP and Vista (32bits). I attach a very small example that triggers the bug. The example is written in C#, and requires the .Net framework versions 2.0 or 3.5. How to reproduce: 1) Compile the example with csc bug.cs The c# compiler (csc), can be usually found in C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe or C:\Windows\Microsoft.NET\Framework\v3.5\csc.exe 2) Run the resulting bug.exe from a cygwin 1.7.10/1.7.11 console. It throws an exception. 3) Run bug.exe from a native windows console (or a cygwin 1.7.9 console). It runs without producing any output, and without throwing any exceptions. Be aware that the bug is not triggered if the example is compiled with the .Net framework 4.0. Best regards, Andrés Martinelli