They are likely to have something to do with your plugins (especially, they are made with VB code because your screenshot says you're getting VB Runtime errors)
But perhaps still related to Plus! if you say they work fine with earily Plus! versions - I haven't just seen Patchou say he's changed Plugin things
But I think it's just that one of your plugins (I hope it's not Hopper as you are using it) has screwed up all your plugins and Plus!.