Properties window wont display today, any ideas why?

What method are you using to activate it?Have you tried shutting AutoCAD down and restarting it?Have you tried resetting your Profile?Any other features misbehaving?

Other features you ask.... A few of my two key commands are no longer working. DI for distance in the command line comes back unknown. I checked my acad pgp file no change there. Any Ideas?Thank you,J

I asked four questions and you answer one.  If you went to your doctor complaining of an ailment and he asked four questions would you also answer only one?  We are trying to diagnose a problem so we need all the information we can get.  Understand?Without any further information the best I can offer is try doing a REPAIR of the installation which is NOT the same as an uninstall/reinstall.  Totally different procedures.  Night and day.

May be your properties window Hiding by another tool bars. please Close another tool bars and check it

Maybe it's off screen too.  Easy to determine just by minimizing the main AutoCAD screen.  How many users display their toolbars vertically?  That's the only way you could hide the Properties palette using toolbars which can be either horizontal or vertical.
John Connor2015-03-10 14:09:41

[QUOTE=Jesbo] .... DI for distance in the command line comes back unknown. I checked my acad pgp file no change there. ...[/QUOTE]
 
Has your acad.pgp file been moved somehow?  Or has its location been removed from the Support File Search Path list in Options?  If the latter, it could explain a whole variety of other things that might not work, since other needed files are likely to be in the same support location.

If the acad.pgp file had been moved, or the path to it somehow got messed up, one would think that many more commands accessed via aliases would have been affected.  The OP could easily test this and report back his findings.