I don't believe so. Since I have my credit card in PayPal and always use that as my funding source, I have the same protections there as if I had used the credit card directly. At least I think so.
Cheers.
It would appear that way, but in practice it hasn't always worked out. I've had to dispute three PayPal charges after auctions gone bad, one with Amex and two with Citi. Amex was a bit easier to work with than Citi, but with both it was *very* difficult. I ultimately got only 1 charge reversed (through Amex), only to find that PayPal simply withdrew the funds from my bank account (I had previously "consented" in their ToS) and then made me pursue my claim through them anyway.
There's information, forums, etc. about this all over the Internet -- I haven't looked in a while, but I assume the info is still there.