I always thought that because we scr3w3d around with the Grob 109 to make it a Vigilant (by raising the all-up-weight to carry parachutes and reconfiguring the fuel system plus other stuff) meant that we created our own set of problems - if we had bought totally 'off the shelf' (like we have with RIVET JOINT), then some of the issues experienced with the type would not have happened.
When buying an aircraft for 'circuits and bumps' then why did we insist on putting parachutes in, when the circuit height of 800ft QFE was below the likely successful abandonment height anyway?
Also, talking to some that fly the civvy Grob 109, they don't have as many problems with the Limbach engine running funny and the only difference that I'm aware of is the reconfigured fuel system?
It seems that as ever the military has itself to blame by not buying of the shelf and insisting that the manufacturer change their preferred specification - we did that with the Grob 115E by insisting on a new prop type for the Tutor and we know how well that went!
Anyway, this has nothing to do with the temporary pause [off thread alert!]
LJ