I've sent the files

Hi Fubax, thanks for sending the files. I've got a fix prepared, I have sent you some info.

- Michael

Thank you, the fix worked. For anyone experiencing the same issue, try the following script assigned to a shortcut (like Ctrl+R) after grouping operation:
script:/*make things faster*/moi.geometryDatabase.setStatic();
This should make things faster =).

Is anyone else having a problem with the hidden line display toggle not working properly? The attached image shows what it looks like with it off and on. No change.

Hi Billabong, Do you have Options > View > "Hidden edges on selected only" turned on?

If so then they'll only display on selected objects.

Another possible explanation is if they are set to be completely transparent.

What do you have in moi.ini under

[Hidden lines]
HiddenLineOpacity=34

- Michael

Hey Michael,
Selected is turned off and here is a screengrab of the .ini

-B

Hi Billabong, maybe it has to do with that particular model being thin walled throughout.

What happens if you make a box, does it work on the box if you set View > Display hidden lines checkbox to be on?

- Michael

I think your right. Another thing I noticed is that it only looks that way from inside the object. The outside of the object looks the way it should. Odd, but my mistake. Sorry.