UPgraded to new Version of Wordpress and marketpress and now site is broken

After upgraded to 4.4 and new marketpress my site: http://www.selkirkauto.com is broken, you will see what I mean if you try the site in 2 seconds. A white popup window is generated in the middle of the site and will only go away if you click around it. I tried reinstalling both upgrades, but that did not seem to matter.
I upgraded to 4.4 - and I used the link to re-install:
You have the latest version of WordPress. Future security updates will be applied automatically.
If you need to re-install version 4.4, you can do so here or download the package and re-install manually: