I am having the same (I think) issue.
I have 3 cameras in iCamSource -- 1 is a webcam, the other two are D-Link Wireless cameras. All 3 of them were showing previously in the iOS app, but now only 1 shows. If I visit the web site you can use to view iCam feeds (sorry, system won't allow a link) and put in the proper user / pass combination I can see all 3 cameras. I've tried removing cameras from iCamSource and re-adding them, as well as deleting the app from the iPhone, but nothing seems to help.