I'm using ISE WebPack 8.1.03i, System Generator 8.1.01, Matlab R14 SP3
The problem is related with the System Generator block which is placed in Simulink to be able to generate a design. For some reason when I click on the Part button to choose the device for which the design has to be compiled the Part list for most of the Virtex devices is not generated properly, e.g. xc4vsx35 is found under the xc4vsx25. For some reason the hierarchy of the part list is not generated properly.
Hope somebody already had this problem and managed to solve is in some way.
Regards, Patrick