When you said "but I'd like automatic imports back" in your OP (sorry, I have to clarify), the game(s) automatic import is working. It's just that the media is not being downloaded when the games are [auto] imported? Correct?
If the games are not auto-importing, make sure the platform (right-click the platform and select Edit) is un-checked to Disable ROM Auto-Import. (Now that I got that off my chest... )
Based on, you can manually download the media, I presume the auto-imported games are getting their metadata (i.e. at least an associated LaunchBox Database ID #).
If the games are auto-importing but no media is being added to the games, despite having several media types selected in Tools < Options < Media < Automatic Imports Media, you may want to file a Bug Report (top of this page, Help & Support, select Report a Bug). Be sure to clarify with [something like] the above sentence. Also note a couple of specific platforms and that they worked before.
Edit: Also note what version of LaunchBox you are using.
In lieu of a bug report, you could instead clarify here the above then hope one of the LaunchBox staff will chime in with some ideas. (which still they may as it's still early on Monday morning. )