Flatten has destroyed my osnaps...

[11s11]

I used FLATTEN and now my OSNAPS are not snapping to 'end' etc, though properly selected. It's a fiasco. They are snapping to an 'end' that doesn't exist.  Not a zoom in problem and gridsnap is off.  The issues is all over, even with simple linework, no blocks.  All should be on the same z plane, right? How should I fix this?  I'm going insane.  

[cadffm]

Check OSNAPZ

?

Restart ACAD

?

Share your data and we can take a look.

Something basic, not a flatten thing I think

[imadHabash]

Hi,

Would you please share with us your CAD dwg file for testing?

[JTBWorld]

If you LIST a line what coordinates does it show and what do you think they should be based on if you hold the cursor over each end?

Try also AUDIT and/or RECOVER. 

[11s11]

[https://res-geo.cdn.office.net/assets/mail/file-icon/png/generic_16x16.png]20221201_Carroll_shorter....<>

Hi, Here is the file, and I've attached a screenshot of an issue as an example...
Thank you!
Susan

[cadffm]

Pls come to the forum: https://forums.autodesk.com/t5/autocad-forum/flatten-has-destroyed-my-osnaps/m-p/11615740#M1094167

and use the [Browse] button in your Reply to attach images and DWG files.