Today I tried to use KAS struts to improve the stability of two vessels docked via junior port.
After creating the first link the vessel experienced massive phantom forces, going from a stable 120km orbit to a suborbital trajectory in less than a minute (without any running engines of course).
It accelerated so fast away from my Kerbal I couldn't even catch it again.

I haven't used KAS struts in a while, so I might have made a common mistake: the strut endpoints were attached to physicless cubic struts - is that a known issue? I believe to remember it worked with the old KAS?

Source : http://forum.kerbalspaceprogram.com/threads/92514-1-0-2-Kerbal-Attachment-System-%28KAS%29-0-5-2?p=1983683&viewfull=1#post1983683