I have deleted all local content and re-installed KSP 3 times now and the new .90 B9 pack as well. I am having no luck with the HX parts series. I am having the same problem as Paul Nixon up there in #1812. My HX series parts just seem to fall through other parts regardless of how many strut connectors I attach etc., Sometimes they just fly apart on the launchpad before I get a chance to even power up my craft at both the VAB and SPH. The HX series of parts looks really awesome and adds alot of possibility to the game. I notice that there are no really stock doors on the HX parts but I've made some really cool doors/ramps/hatches etc,. utilizing Kerbal Attachment system and Infernal Robotics parts. I realize there is a runway weight limit and I haven't exceeded that yet and only do I break the launchpad when these super heavy parts fall off my craft. Is there anyway to make the HX super large parts more rigid or stronger when they attach to each other?