TaintDroid does not allow 3rd-party native libraries to load. This may be causing the runtime errors you are observing.
As for the camera not working, it may be a library problem. In which case, it would be best to debug the build without using TaintDroid.
Also, we've only tested TaintDroid on the Nexus S, and not the Spring Nexus S 4G. That's not to say TaintDroid does not work with the Nexus S 4G, just that you will need to do a bit more (see the other thread in this mailing list).
-Will