Decouplers do not hold rocket, struts do nothing

[stratjeff]

Never had a problem before 1.2.2, and even when using stock parts, I can never do any kind of multiple core launches.  It just flies apart, no matter how many struts.  Help!

 

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[dangerhamster]

Have you tried strutting directly between the boosters top and bottom?

[stratjeff]

Well, the rocket is in the way, so that's impossible.

I've also noticed the radial decouplers do *nothing*.  Don't even hold the side boosters on, they immediately detach upon loading on the pad.  I've been playing the game for years- yes, they are attached to the decoupler correctly, and yes, I've strutted the crap out of it.  Still no avail- struts do nothing!