still getting the same error i linked earlier after updating. cant import/export the Heavy Machine Gun .dts
Looking at the error, is it really blender's fault? it says tuple object doesn't have x attribute; that looks like an issue on your end port. would replacing quat.x with quat[0] fix it?
edit: probably not. i can import/export m.dts fine. it seems to be an issue with certain .dts files. should look into what makes these break your thing. the HMG is a considerably simpler model compared to phy's heli, so you probably should look at that first.