White Screen after 5.0.40 to 5.1.2 Upgrade

Hello,

We were having an issue with the EasyBlog 5.0.40 admin being really buggy and we are unable to upload cover images 95% of the time.

I just upgraded from 5.0.40 to 5.1.2 on our staging site http://staging.shareandcare.org which seemed to resolve all backend bugs and upload issues, but now we're getting a white page throughout the site and nothing loads. The blog url is http://staging.shareandcare.org/news/blog

The production site is still on 5.0.40 http://shareandcare.org/news/blog

We need either:
1. To resolve the issues on staging so we can be sure it's safe to upgrade production
and/or
2. Resolve upload issues on production

Please advise.

Thanks,
Kevin W.