I think I accidently posed my question in the wrong forum so I'm trying again in the AutoCAD General forum... (I have no clue where I sent my original post.)
One of my users said a couple of days ago his AutoCAD 2009 stopped bringing up the open dialogue box to browse for files. For some reason, when he would go to File -> Open, instead of bringing up a dialogue box, AutoCAD would just prompt for the file name/location in the command line. I thought that installing 2010 would get him back on track but unfortunately, he migrated his settings so we're back to square one again.
I tried looking under the Options -> "Open and Save" tab, but couldn't see any setting that would control whether or not the open dialogue box would stop showing.