Kinks in straight lines while using Ortho F8

Hi

New to autoCAD. I am using Ortho Mode F8 on. This has been giving me perfect lines on screen. Now for some reason i have kinks in almost all my straight lines. I am sure i have hit some setting but have no idea why. Also I have lived it with so long I cannot use undo.

I am sure this has already been answered but I could not find it.

Mark

Please post a picture or the file.

Hi I have uploaded the whole file. You can see this kinks I hope. Don't bother making comments on the structure as i am sure i can improve that with more study.

Thanks

File for Cadtutor.dwg

Use PLAN, World, enter. It will zoom extents and you will see you also have some objects a long way from the plan so you will want to take care of those as well.

View => 3D View => Top

Hi Again

Thanks for this. Having asked I started to think a little and wondered if it was the axis. Fiddled a little and it was. So now all is fine. But i am thrilled to have located this forum and people like yourself who look at the actual file. Also crazy but my study so far has not mentioned Plan or world so they are new concepts to me and will require research.

Thanks