Hog PC 2 - MacBook Pro - Encoder Wheels

I hope somebody may be able to help with this! I hope it is not a case of RTFM but Hog Pc 2 operates well loading shows for a installation programmed on a desk BUT if I need to adjust anything using the wheels they only take the values down.... All other functions work and the show is being outputted through a 4 port widget.

Any ideas would be greatly appreciated.

Macbook Pro 2.4Ghz 3GB Ram
Parallels
Windows XP Pro
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