B9 Aerospace glitches

[Chel]

I've been playing around with B9, and just so you know, I haven't updated to 1.3 yet (until some of the bugs have been fixed), and when I use the HXU parts, especially the HXU big 8m square hangar, and put two of them together, when I launch the craft, the hangar pieces just literally 'snap off' from eachother, then everything goes everywhere, and everything's destroyed, even with 'Unbreakable Joints' ON. Another glitch or bug is when I add particular parts to my craft, I think it's the winglets, like the 3x5m, 5x6m or whatever, when I launch the craft, it just gains speed at like 500m/s within 3 seconds or something, and then breaks apart and explodes. What could be causing these? I've installed B9 correctly, so it isn't that, but what are your suggestions as to why these are happening?