I'm running Repetier host V0.40 on Windows 7. If I add a file postfix in the skeinforge setup window then a file not found exception is generated when skeinforge is finished slicing and repetier tries to load the gcode. The gcode file is generated and it can then be loaded manually afterwards:
C:\repetier-work>dir
Volume in drive C is OS
Volume Serial Number is 1E11-6114
Directory of C:\repetier-work
18/03/2012 12:17 PM