I too was trying to use MenuControl from Dacons. Under FM12, I also have experieced the crashing at startup. I emailed over to Dacons about the problem and asked if they had a beta of a FileMaker 12 version of Menu Control. Dacons told me that they don't do public betas. I asked about a timeframe for a new release compatible with FM12 and they said they couldn't give a hard date when the updated MenuControl would be ready. I believe this was over a month ago.
Hope this info helps.
Still nothing about new version...
They are awful. Get CNS Menu.
The conversion FM 10 > FM 11 took them 4 months. They charged more than 300 euros for the upgrade, in which there was no functionality added except for the compatibility with FM 11.
Now there's still nothing. On april 19 they told me: "We are working hard on this. We hope to provide an update shortly.". The FM preview version was in february. That makes 8 months now.
In all my applications I have now finished the transition to CNS Menu. It was another 600 euros, but my clients can't wait that long.
I moved from MenuControl to Menu Popper (http://www.dracoventions.com/products/2empowerFM/family/menu.php)
because at last I only used the MenuControl plugin for the dynamic menu's and the
I could change to Menu Pooper for about the same price as an upgrade for MenuControl.
Hope that helps,
Ruben van den Boogaard