For a very long time (12 months?) I was having some problems with GA stats, i.e., not all transactions were counted, no e-commerce data associated with adwords, campaigns etc and referer set to paypal. HOWEVER, in the last two weeks this has changed and I the referer is now correctly set to google/cpc and the ecommerce data is associated with adwords
This is great news, thanks to all the e-junkies!