I have a Fortran program that has worked for years under NT 3/4. I recently moved to Win2K. After recompile/link, I get errors such as floating invalid that I never had before. If I bring over the pristine executable currently in production (compiled under NT4) and run it on Win2K, I get the same errors. If I put my Win2K-compiled executable on NT4, it works perfectly. Any ideas?