i've been using draftsight successfully for about the last 2 years drawing schematic diagrams.  2D only.  While working, i'm constantly panning and zooming around as i draw stuff on the page.  Somehow, i must have accidentally held the shift key down while doing this and activated the rollview command - tilting my drawing in 3D.  How do i get it back to where it was ?  Also - on another drawing this happened again but i was able to mostly get it back via the undo command.  But not completely - several of the lines on the page wont trim or extend to each other now - draftsight says they are not coplanar.  And drawing horizontal lines works fine, but now it wont draw vertical lines correctly.  please help - i really do not want to delete these 2 drawings and redo them.