Hi Jeremy, > Is there any known issues from switching from the MS Compiler to GCC? Yes or no. Depending. What version of GCC? What version of the Microsoft compiler? What compiler language? What operating system? Same OS, or moving to a different OS? If staying on the same Windows operating system, what environment? Cygwin? MinGW? MS-SFU? Interix? MKS? Targeting Win32 API? Cygwin.DLL as a Unix-workalike? Or one of the other Unix-like environments? GUI? CLI? Sincerely, --Eljay