I had some problems again this morning. Here's the trail of events as best I can recreate them:

I tried to use paypal express checkout without creating a store account and got the 'can’t display webpage' error when it first transferred to PayPal (tried it twice).

This is the URL for the “can’t display” page.
https://www.paypal.com/us/cgi-bin/we...00c8820f2d2c73

The order did not process. But then when I went back to the store, a new account had been created for the customer – even though the customer never created one. And it shows no orders.

Here is the error page URL for the second try, same process as above.
https://www.paypal.com/us/cgi-bin/we...00c8820f2d2c73

I logged off the site. When I discovered the account automatically set up, I logged on again and with the same PayPal account as above I did the same thing. I purchased an item using the express checkout without logging into an account in the store. This time the order when through – with a record of it in both my shopping cart and in my PayPal account. The customer got a confirmation from my website and paypal.

But, instead of the “thanks for shopping” page I got an error on page with this URL:
http://papergardenprojects.com/store...eckout_process

Then, I started over again making a purchase with an existing store account. I got all the way to through confirm the purchase on PayPal. After confirming the order I got Internet Explorer 'cannot display webpage' error instead of being redirected to my site for the “thanks for shipping page”. But the order processed and its in my cart, paypal account and the customer got a receipt.

This is the URL for that error page.
https://www.paypal.com/us/cgi-bin/we...00c8820f2d2c73

Meanwhile this week I had a bunch of orders that went through fine.

Any idea what's wrong? I can't understand why express checkouts don't go through the first time, but succeed 5 minutes later. Why all the error on page errors? There are so many paths through the checkout process, it could be path-specific, but I haven't been able to find a pattern. Do you think this a PayPal problem? Might I have something set up incorrectly?

Thanks for any help you can offer.