When I'm in item list, if I clicked 'customize' when the popup open I can see my custom field in 'Available Properties', but if I selected one or more to 'Selected Properties' after save, the columns doesn't appear in list.
With regular fields work, but with custom fields doesn't.
Please make sure that you have changed the screen that the project is using (click on project administration - top right) is set to show these fields (Administration -> Screens under Items).