Also problems with buying, but I will try to remove the mod.
A few people are having this issue where the game freezes when they are trying to buy the bales, and in all
cases so far the "realistic beacons" mod were to blame.
I have discussed this with the author of realistic beacons mod and pointed out that his mod will cause other mods to stop functioning if they define a vehicle without the "lights" specialization.
But he does not seem to care about this, I think he should as this might cause future "mod conflicts" when more gets released.
I can easily fix this on my side in the next release of Buy Bales, but I'm not in a hurry as the mod seems to be working very well over all.