The recent update seems to have broken usermin

Heyas,
Since running the recent virtualmin+webmin updates (upgrade to webmin 1.420) usermin no longer works. The package updater reports a newer version of usermin available however despite the install script running through to completion, the package is never removed from the update list and usermin never starts up (even when trying to manually start it). I've tried fully removing usermin and reinstalling it, still no go.

Any specific information you require on this?

Thanks,
Wes