When you have issues with the GUI it is mostly because you have something = running in the GUI thread that is not supposed to be there. The problem is = usually that the code is introducing blocking delays which freezes the = application. I guess that if the delays are short enough it could result in= the = effect you have. If not already done, try putting the USB communication routines in a separa= te = thread. Chances are that the code for the Com ports already runs in separat= e = threads which is why you don't see anything when using the virtual comport. This is just a guess and it's hard to tell anything without seeing your cod= e. /Ruben > I'm using Visual Basic 6.0 with HID Method and PIC18F4550 for usb device = > interface. All data can receive and transmite with successfull between = > computer (VB6.0) and PIC18F4550. But the motion of animation flash is = > not good (Not Smooth). The Flash animation is integrated with VB and = > driving the animation also with VB. > = > When i'm trying to change the HID with CDC (Virtual Comport) the Flash = > Animation is good and smooth motion. > = > Can anyone on this community help me, why the animation flash is not = > smooth when i'm using the HID method??... What's wrong with this situatio= n?? -- > Regards, > = > _*Cluthax*_, > *email : cluthax@gmail.com * > = > " sent from my gedhangberry=AE wireless device " =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D Ruben J=F6nsson AB Liros Electronic Box 9124, 200 39 Malm=F6, Sweden TEL INT +46 40142078 FAX INT +46 40947388 ruben@pp.sbbs.se =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist