I have been using Draftsight for several years and just downloaded the most recent version.  I'm finding it unusable.  I imported some pdf images and they disappeared after I had worked with them for several days.  Now the scale seems to have gone nuts and the screen width in model space is now miles wide.  The drawing that I was working on in model space has vanished, I suspect it's there but so minuscule I can't fine it.

What's going on?  What is the command to show drawing extents full screen?  The command for the properties table seems to have found a new  hiding place and I can't find it.  Any suggestions other than buying a drafting board and a T square?

Vince Homer