I'm designing a widget where I would like to display the categories available for a custom post type, and then allow the end user to select multiple categories that they would like to include in the query for this widget.
The widget options form displays just fine (before a user has save any settings, but after the instance's options have been saved, the multi-select widget goes wonky and only displays the "Use All Groups" default option.
Can someone please have a look at my current form() and update() functions from my widget? I've pasted the entire widget code here:
After saving the options for a new widget, the options in the select box all throw an error saying that the $use_groups variable in my form() function isn't an array.
(I originally posted this in the main Plugins & Hacks forum, then remembered I should've posted it here)
Can anyone help me figure out what I'm doing wrong here?