I have had this same problem this week. I bought off ebay and my paypal account showed payment pending as an echeque had been issued. I had no idea why the payment had not been taken from my bank account which usually happened. I looked at the payment source on my paypal account and it showed that the payment from my bank account had been 'unticked' not by me though, anyway I will now have to wait for about 10 days for it to clear. I have changed the payment source on paypal to the correct account, so hopefully any future transaction will be ok. Seems to me that these echeque things are a way that paypal can collect money, keep it for a while before paying it out.