So, I’m still not quite following what the actual issue is. I logged into your site and I can edit pages just fine in your WP admin. What do you mean exactly by, “When the Edit page is selected I just see a blank page.” ? — Can you elaborate a little more? A screenshot maybe? Is it possibly an issue on your specific computer or web browser?
Here’s what I see on your site: http://www.uploadblvd.com/uploads/image_50ea08e4d0f90.png
Note: WordPress changed the name of the “HTML” tab to “Text” in WP 3.5. I’m not sure if that’s causing any confusion for you.