Hey, the errors you were encountering have been fixed so all articles should load correctly now - about your missing articles, I took a look at your account and you seem to have a large list of Building articles still available in your world.
To check if any are really missing, you can go to the Articles & World Manager and on the top left where "Tree" is selected, click the down arrow and select "Template Type" and then "Building" to display only articles of that template type.
I suspect you are using Tree and since that mode doesn't show the entirety of your articles and categories if your world is very big (and since your articles are under a category or other article, they wouldn't be immediately visible), you might have just not been able to find them there. Take a look and let me know!