Training Stream - Drag and Drop w/ UMG, Part 3 - August 4th, 2015

I keep getting weird errors every time I open my test world ever since upgrading to 4.8.3 such as Failed import for StructProperty" for the widget drag. There are usually 2 other errors for random stuff in the inventory but they go on and off randomly.
In terms of functionality dragging stuff from the inventory to the action bar works but dragging it into the world only gets rid of the item in the first slot no matter which item you drag or where its position was in the inventory. I can’t rearrange items in the inventory but can in the action bar and I can’t use items. I’ve checked all the relevant functions and blueprints but can’t seem to find the error.

I’m probably missing something obvious but I have we watched all 3 streams twice to make sure I didn’t mess something up. Its not worth wasting your time troubleshooting it but if you can post it somewhere other than the Learn tab that would be extremely helpful.