I'm enbassased although I still think it's strange that this is occurring. You are correct! I went to Default, and the /mouseto pack 6 1 is working fine. With my UI, I still am having the same problem where 6 0, and 6 2 through 6 9 work fine, but when I do "/mouseto pack 6 1" I get the USA...

I ran into what appears to be a bug in the /mouseto function. It's totally reproducable for me, and I tried it with my last two inventory slots. When I use /mouseto inv 6 -- it points the mouse at my 2nd to last bag *CORRECT* Then I use /click right which opens bag *CORRECT* Then I can type /mouseto...