Hi xcalc occasionally doesn't see the X server: >xcalc Error: Can't open display: 127.0.0.1:0.0 It gives a warning when it opens correctly: >xcalc Warning: No type converter registered for 'String' to 'Bitmap' conversion. Why is this? This is a fresh installation of Cygwin DLL 1.5.5-1 running on Windows 2000 SP4. Thanks Michael