Another one likely hailing from the move to integer rather than string IDs - while the "View Gearbox" page will display e.g. "2 speed Non-Synchronous", the "Modify Gearbox" page only shows "speed Non-Synchronous".
This on 2.3 or 2.2? In 2.3, be careful with the modification system as it can cap all ratings of your designs to 100.
This is in 2.3.
Good to know about the modification system. I've just been re-designing as I like to make tweaks, even that was probably sub-optimal even previously.
Fixed, changes will be in the next update.