Just tried mine again to confirm.
OK a long shot in the dark.
When you pull the drop down to assign Amplitube3 have you first used the "Add VST plugin..." that's at the bottom?
I know, and this is a bug, that Amplitube3 shows up on the list already but that one doesn't work right and will lock things up. The wrong one is "VST AmpliTube 3" the right one, if you added it correctly will be listed again at the bottom as " < VST > AmpliTube 3 "


John
ESI Gigaport HD+
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15.6" Monitor
"The only Band is a Real Band"
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