I am looking at it know and i don't see a problem. What is it?

Jim

Try to take an object and place it in an exact spot.
I use my center wheel to rotate the screen, sometimes
when I click the wheel to rotate, everything disapears, and
I have to zoom way out, then back into the object...
I can not place an object in an exact spot anymore

If you zoom all, it gives that expanded view that doesn't show the printer, so I assume there's a stray object a long way away from it, although I haven't been able to select whatever it is and zoom select to find it. But your printer is located at the origin, so just put a selection fence around the origin and zoom selection. Then export the selection as a new file (or replace the current file under the same name), that'll exclude the black hole and zoom all will only show the printer, inadvertant zoom through swinging it around will be the same.

the problem is that you have a solid translate far away and separate from the main assembly, so what happens is that you can not see all the parts cause on perspective are so small for the view.

Move, hide or delete that translate solid will back the things ton normal state.

I did try twice to upload the file corrected but forum systems upload fails for some reason

Luis G

could be both, if you move objects with the gripper, some times lost relationships act weird, gripper still have bugs, I prefer to use move command instead when moving groups or complex parts with several relationships (that it seem to be your part's case) to avoid this weird glitches, I also delete often relationships on objects since shark/viacad have very nice local edit features (delete faces, move faces, holes, etc.) so in most cases the objects history is no longer needed.




I just reopen the file i modify and doesn't have that issue, try to cut/paste that part if you don longer need its History

Luis G.