Safari 5.05 breaks Paypal shopping cart

I had a customer complain today that they were having a problem ordering products from my web site, they were using Safari. I thought maybe it was a temporary Paypal problem or something but after extensive 4 hours of testing I find it's Safari that is the problem I know v5.05 is broken but don't know about older versions.

I have many items on my website and use Paypal's "add to cart" buttons. The problem happens at random times. Basically when adding items to the cart, it will occasionally empty it's contents only leaving the last added item. My customer was buying over 20 items and never got past item 18 even after trying 4 times.

Sometime the cart would show up empty after the second item, sometimes it looked like it was going to work all the way but showed empty at the 18th item.

I tried to duplicate the problem and was able to constantly re create it though sometimes it took more like 30 items added. I even created a new page with new buttons and was again able to recreate the issue over and over. This proves it's not related to a single button or item.

So I then loaded up Chrome and tried it. I added over 80 items 3 times and it never failed. Went back to Safari and bam, it happens.

I am convinced it's either a bug in Safari of something that's just not compatible with the way Paypal works.

I don't know where the temporary cart info is stored, I thought it was stored on Paypal but now I don't know.

If anybody could shed any light on this subject I would really appreciate it.

Thanks!