2 Hauppage Nova-T sticks

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TV-Server Version: None
MediaPortal Version: 0.2.2.0 + SVN (11 June)
MediaPortal Skin: Blue Two
Windows Version: Windows XP Pro SP2
CPU Type: Intel core Duo
HDD: 60GB
Memory: 512MB
Motherboard: No Idea
Motherboard Chipset: Intel something
Motherboard Bios: N/A
Video Card: Intel Something
Video Card Driver:
Sound Card: Intel Something
Sound Card AC3:
Sound Card Driver:
1. TV Card: Hauppage Nova-T Stick
1. TV Card Type: DVB-T
1. TV Card Driver: Hauppage Driver (BDA)
2. TV Card: Hauppage Nova-T Stick
2. TV Card Type: DVB-T
2. TV Card Driver: Hauppage Driver (BDA)
MPEG2 Video Codec: MPV
MPEG2 Audio Codec: MPA
TV: 26" LCD
TV - HTPC Connection: DVI->SCART

I have got one Nova-T stick working perfectly, have installed the other, and windows detects them both in Device Manager (and I've checked both are using BDA drivers). I've added one to the Capture Cards list in Media Portal, and it works fine, but when i click Add again, it says

No video capture card(s) were found, you won't be able to configure a capture card.

The only thing I can think of is that its somehow confused because I have to identical tuners? They are both pluged into a USB Hub which is plugged into the Mac Mini.

Any suggestions or help would be appreciated.

Thanks

Mark