I ended up going out for the day so didn't get much done in the way of mining, either with the entrance tile checks or with the 'odd' tiles. Also, keep having to stop to get wood for supports and food to eat, lol, i've completely run out of food in the base as all I seem to be doing now is mining!
But, here's an update pic - as you can see it's just getting bigger, the tiles the other side of the straight line are all minable but only have rocks so i'm leaving that side for now and concentrating on the 'shape' side. The tiles to the right of me are all minable also.

I'm not sure if this is still interesting to anyone now we know it's just corrupted tiles, so if it isn't, just say - i'm only really continuing for my own interest and posting results for those who are.
I've had a few msg's on the subject, so just to clear some questions up -
1) She's not too tired - I'm not a total idiot!
2) The rock is not too hard
3) No msgs come up
4) She reacts as if it were an entrance tile and does nothing, as in the pic.
If anyone wants to come check it for themselves, because they still think i'm missing something simple, lol, then i'm ok with that so long as I know you or someone I know can vouch for you, like Em for example.

Also, I haven't bothered the devs with it but if anyone else thinks they would be interested feel free to mention it to them, i'll give them the location if they need it, obviously.
