OK, I have tried with both on and off for both sources.
On the remote iCamSource, i get: UPnP Dual NAT Ext_ip 192.168.1.196
On the local one I get: NAT -PMP 3,-7,61 - switching that on stops any pictures coming through! (same with the remote I think too)
Is there a way of deleting the preferences file? I suspect that MobileMe sync has overwritten one of the preferences files between the two machines - hence the reason I seem to get sometimes the images from the second iCamSource...
Also it is odd that iCamWeb seems to get both iCamSources OK without any problem on my mac connected on the same router as the iPad. Do you know why this is?
PS: and while I'm at it, could we have a future option to choose the orientation of the screen - I always prefer the screen the other way up!