The main apparent weakness of UCJ-c as well as most (actually all widespread) CJ scripts is their relying on a parameter called HTTP_REFERER.
I am posting a thread about inaccuracies of CJ scripts and the relying on HTTP_REFERER for those who like to know where the problem comes from and the reasons why it will get worse till the point where it (soon) will be "unbearable"...
http://www.gofuckyourself.com/showth...threadid=73124
NOTE: I must state that this is not a weakness of UCJ only but a problem of any script relying on that HTTP_REFERER value?