[Cura suddenly will not set model flat, does not have full tool list.]

Screenshot of stl. Upside down to see better. No stray triangles.

[Cura suddenly will not set model flat, does not have full tool list.]

After 4 months of problem free use, Cura 4.8.0 changed. Now models  do not position flat. First image shows Z = 0, but model is ~3mm above plate.
 

 

When I press "lay flat" tool, model positioned at weird angle, not flat.

 

Also, this tab used to have 3 options (until last week).

Perhaps Cura had some changes? 

1. Can I roll back?

2. Should I reinstall?

3. Is there a configuration fix?

Thanks.