I was doing some playing with the resource settings after seeing the posts in here, and came across an odd bit of behavior. When buying weapons, having the 0 resource cost and any credit cost works fine, but adding ships in with 0 cost did something odd. The ship canceled production, and the weapons also restricted themselves from purchase or refit with the usual "Literally Hitler" error. Placing the resources required to produce both ships and weapons in storage subsequently did nothing to unlock either for purchase/production, even after swapping the required resources back to 1.0.
There may be one more check or flag that's not been changed somewhere other than that, or an unanticipated interaction occurring. It persists across saves and restarts. Oh, and of course, thank you for fixing the UI. It's been nice.