Occasionally when using user defined blueprint structs, blueprint nodes that reference them can reference an older version of the struct. This usually requires you to re-create or refresh the node to get the newer version of the struct. A lot of times this isn't a permanent fix, and upon restarting the Editor you may find yourself having to go back into certain blueprints and refresh them.
This plugin automates the refresh process.
The best way to use this plugin is to specifically select and order which blueprints you want to compile in the plugins project settings which can be accessed via it's editor toolbar button.