I am finding a few issues very similar to the ones described here in the last 10 pages or so.
I have managed to get the Paypal IPN orders status to atleast update to "awaiting dispatch" after going through the payment process. How-ever for some reason the order duplicates at this point. Which still leaves a order in "Preparing [Paypal IPN]" status. I initially had trouble with the status not updating at all how-ever i managed to get past that point.
For some reason ever since installing this module i have had issues with my checkout process alltogether. It seems that NO information is passed to the admin area. I basically get a blank order for ANY payment method, (paypal, cheque/money order etc..) There is no telephone number, address, price, tax, shipping information getting passed into the order on the admin site. The confirmation email gets sent with full information without any problems and all information is displayed correctly there, how-ever just nothing at all in the admin site.
Has anyone seen these issues before, or know anyway to fix them?!? Luckily of course this is only installed on my development site for the moment. How-ever we were hoping to get this into production within the next week after all testing is completed.