Can you provide more info about this? Item ID for example.
I have information about problems with talent preview on TC characters, but this issue is still not resolved yet, I'm working on it. Also, look at your debug log (http://armory_url/cache/_debug/), maybe there's some info about your problem.
Same thing happened to me too.Tested on different characters, it shows NO item, and the loading bar is stuck at 0%
This is the debug file : http://paste2.org/p/1041896
I can`t find armory_classes anywhere! I`ve searched in all .sql files and there is no table called armory_classes