The default setting on the I-PAC is for P1 Start to be the I-PAC shift, not P2 Start.
You can have P2 start as shift if you want to, but why not stick with the standard and make it P1 Start? Then assign P2 Start in the lower (blue) half of the table to be ESC.
You could simply load the default back in. The default maps are in the "templates" folder in the WinIPAC install folder.
Andy