Page Frozen after Updating Website

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I updated the website a few days ago to the latest/greatest version of C5. Now, the PayPal
buttons on my Order page only work for WIndows users (according to PayPal tech support who tested on their PCs).

Not good for business. I tried to put a notice on the Order page saying that we were having trouble with the Paypal links, but I couldn't highlight the appropriate box to type in a message.

I then tried to revert to the version of the page I was using before all this trouble began. I clicked on it so that it was highlighted, hit approve and nothing. Still stuck with the non functioning page.

www.www.billmosstents.com/orderbooks... here

I would be so grateful if someone could help me out! Thanks

(I posted earlier about the PayPal buttons not working on Macs. That was before I realized the whole page was quirky)