Seems like there is an infinite loop when LV tries to load this new palette. This usually happens when the new .mnu file and LV's existing mnu file recursively link to each other.
Maybe you can try this: 1. Remove the new .mnu file from where it is now. 2. Put it in "<LV>\instr.lib" directory. 3. Launch LV, and "Instrument Drivers" subpalette will be automatically updated to have the new VIs. If this doesn't fix your problem, I'll need more information on your mnu files.
