Re the resizing: I cannot reproduce it, so I really can't say much more -- you can see in the video I posted in the bug tracker that I was able to edit the dimensions without a problem. If you're not able to do that, then see if another plugin or theme is hijacking your CSS or try customizing your HTML by adding your own .tpl files as described in the wiki. For testing I usually deactivate all plugins and if the problem persists, I sometimes switch to a different theme (even the built-in WP themes can cause problems).
If you did a manual update and you're running into problems, I'd try uninstalling the plugin and downloading a fresh copy. Just back up your definitions first under the CCTM's Tools menu, and also be sure to clear your cache (current versions of the CCTM will cache the tpl files used to draw the custom fields in the manager).
No database updates required: the CCTM does not ever make any database modifications. Not sure what you mean by the "listing by category function", so I can't offer any guidance on that, sorry.