I don't know what you mean with "the zoom text is highlighting". Can you be more specific or provide a screenshot?
In general, if the tile collision editor isn't working, it's usually because you're using an external tileset. You can't edit a tileset while it is external, so you'll need to temporarily import it. This will be fixed in Tiled 1.0 (I'm mostly done fixing it on the
wip/tilesetdocument branch, but it caused a huge amount of changes).