I asked GWB support about my missing categories/tags. They said they are working on it, though it has been a while and others are also missing categories, I was satisfied to get a response.
They also sent me a link to show that they were making improvements. Here’s a nice article about how they used Stackify to identify they had a lot of exceptions that was slowing down the site. I hope to see continued progress. Maybe they should start posting their own articles on GWB what they are working on and planning to do.
Thanks GeeksWithBlogs.net! I hope to see more improvements to make this an even better blogging community.
EDIT: My categories are showing again on 7/14/2015.