Using Igo 8.3.5. and trying out GJ6.18p_da.

When booting it is interupted by this:
6130

following instructions elsewhere on this forum I deleted the AutoExitShutdown folder in Extension folder but made no difference.

Another problem with this skin is that I cannot designate a 'road' as blocked. Its actually not a road its a path but mapping reads it as a through road.
I can identify this road, but the "Blocked" icon is faded out and not operable, whatever way I try to do it.

For years I've had to advise people not to use GPS device to locate my address as it will send them down a blind footpath.

I don't know where you found that instruction, because a FFUIerror indicates a data.zip or branding.zip error.
When it happened using the skin, not happening in standard mode, it must be the skin that is faulty. Or the skin is faulty covering your resolution (which one?).
So I suggest that you download another time that skin and try again.

TY nabi
I'll try that ( or maybe just stick with previous skin)