Looks like when you open an item and try to move to another collection from the "Actions" drop down it doesn't work. Works on individual items from the collection view though.

Ah! Ok, got it, thanks! At the moment we use label fields for this function (in the field properties just choose not to allow users to create new labels, and only allow one to be selected). I’ll definitely forward on your dropdown suggestion though – I see your point. Also, thanks for the bug report. Would you mind sending your email address (& mention your HN username & issue) to info@zenkit.com? One of our developers will take a look at your case :)