If you're in the industry, you must have heard by now the Spybot Search and Destroy is immunizing against CJ links. Anyone with that feature turned on is blocked from the CJ domains (cloaking does not help), and never gets to the merchant sites to make a purchase.
The question to Spybot is why are they blocking CJ? Is it due to all the shady affiliates, BHOs, adware that infests the CJ programs? CJ of course isn't the only network who is lax in their policing of shady affiliates, Linkshare and others are just as guilty.
Check out this blog for more insights:
Affiliate Marketing Blog by AMWSO: Commission Junction Damaging the Future of Affiliate Marketing! - Affiliate Marketing Blog