Here is the latest maintenance release for GD Custom Posts And Taxonomies Tools Pro plugin that includes several bugs fixed (including missing taxonomy columns from the page and other hierarchical post types editor grids) and few other minor changes and improvements.
When you added column for a taxonomy to appear on the post type editor grid on the admin side, it was working fine everywhere except for the pages and other hierarchical post types due to the differences in WP filters for these columns. This is now fixed. JSON function were failed to load for PHP older than 5.2 if they are not in the system already.
Few more things were changed and improved, and more new features will be coming soon.
More about GD Custom Posts And Taxonomies Tools: