MDrummer Undo greyed out

[goldglob]

Quick Setup/ Master Effects tab (the one next to Designer tab).
I hit the Generate tab..all good, a master effect is generated.
I hit the Generate tab again..the UNDO button greys out (and stays out until I restart MD)?
I can keep generating but can't undo.

[MeldaProduction]

Whoops, a bug , added to to-do list .