i'm not sure if you changed the evaluation criteria in the TMS or if there is an issue with the rating system.
i have an image target, which i used in a project a while ago (may 2012). back then it was a 4-star trackable and in my TMS it is still rated as such.
for another project i uploaded the same picture gain yesterday, but now it is recognized as a 1-star target eventhough the feature points seem to be recongized correctly. the target is very similar to the stones target of your demos, so the image selection shouldn't be a problem.
can you explain this?
please let me know ich you need any further information like the Target ID.