Here goes ********************** deniz@HPdv7:~$ playonlinux --run "SolidWorks 2007" PlayOnLinux v3.7.2 Checking python : [ Ok ] deniz@HPdv7:~$ Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.42 Copyright (C) Microsoft Corporation 1998-2004. All rights reserved. Types registered successfully Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.42 Copyright (C) Microsoft Corporation 1998-2004. All rights reserved. Types registered successfully Microsoft (R) .NET Framework Assembly Registration Utility 2.0.50727.42 Copyright (C) Microsoft Corporation 1998-2004. All rights reserved. RegAsm : warning RA0000 : Registering an unsigned assembly with /codebase can cause your assembly to interfere with other applications that may be installed on the same computer. The /codebase switch is intended to be used only with signed assemblies. Please give your assembly a strong name and re-register it. Types registered successfully ../../src/xcb_io.c:445: _XReply: Assertion `!dpy->xcb->reply_data' failed. deniz@HPdv7:~$ **************** any idea?