I tried making the url HTTPS but then some other web site showed up at your address. Not to mention that I had to add a security exception since the certificate didn't match.
In case you are not interested in wasting a lot of money on HTTPS certificates - check this site for a free one:
http://www.startssl.com/?app=40
Ya, this OpenBitcoinStore thing isn't working well for me. It doesn't have SSL support, and as you saw it seems the shared IP is going to cause issues with site conflicts. So I'm going to have to move everything to my own server for SSL to work. Could also be related to why paypal doesn't work - maybe it needs to talk to an SSL page to hand off the details etc. They claimed it was a one-click deploy but it's been kind of useless as I've spent considerable hours trying to get things arranged and functioning in a way that ANY web store would need. I should have just started on my own server to begin with but I thought this sounded like a quick way to get it up for people. No such luck.
Anyway, thanks everyone for the patience. It'll get worked out.
(SSL certs no problem - have used StartSSL before and done all this before manually via SSH - oh, when point and click is harder than bash!)