http://bugs.winehq.org/show_bug.cgi?id=11822
--- Comment #17 from Tony Indrali tony.indrali@gmail.com 2008-03-11 20:17:16 --- This reminds me to a linux "bug" where a barcode reader can't be detected in PS/2 port unless a keyboard is attached serially..
By any chance, is the keyboard you use in one of the client is PS/2 based and the other is USB based? How about the server's keyboard?