Well, not a true fix but a bit of a workaround until its patched.
If you go to the engineers base, you can freely upgrade all your modules UNLESS you cursor over an upgrade that you are missing mats for. Have not yet tested this remote.
Does that make sense?
Say I am upgrading G5 MC at todds place. As long as I have ALL the mats required to do the upgrade, it wont soft lock.
If I don't have the mats necessary to roll, and select/mouse over the upgrade, then the screen will soft lock.
If it does soft lock, simply press your right panel button. Select engineers, then back out of the screen.