I'm new to PirateZ (and OpenXcom generally) so perhaps I've missed something, but I haven't found any reference to the bug I'm encountering anywhere on the forum.
On the inventory screens, both before and during a sortie, the hand slots are often blanked out and items can't be equipped to them. Using 'clear inventory' on someone in this state causes further oddities with blank spaces in the equipment store at the bottom. I've attached a save which should reproduce the problem.
If it matters, I'm on Kubuntu, and I compiled OpenXcom-extended myself from the git page.