I'm using a ModelAdmin subclass to manage a list of front-end users which are extended from Member. Everything is functioning just fine except that only members of the main administrator group can create and edit these new members and I want my Editor user group to have these privileges as well.

I've added the relevant permissions to the editor group through the Security.Permissions tab and even tried adding canCreate and canEdit to my Member and ModelAdmin sub-classes but nothing seems to work.

Does anyone know how I go about granting my Editor group the permissions needed to create and edit these Members through ModelAdmin?

I'm using SS v.2.3.7 with the 2.3 branch of DataObjectManager and SWFUploadField as well as the stable release of Multi-Step Form.

Same problem here ... i'm investigating but nothing found yet.

Probably my problem isn't really the same.
My problem was with standard extended classes of DataObject used with ModelAdmin. With only access permission in the member group the user could only view ModelAdmin interface, but not add or edit items.
Next i try to add this code on my managed DataObject classes

function canEdit()
{
	return true;
}
function canDelete()
{
	return true;
}
function canCreate()
{
	return true;
}
function canPublish()
{
	return true;
}

and now users of groups other than Administrator can add and edit items (if i set access permissions in in security tab).

Thanks mirkosassetti, that works on my setup as well. It looks like all four functions are needed and not just canCreate() and canEdit()

Thanks for posting that code, mirkosassetti. It solved my issue too.