I am collaborating with another office on a project and they are using AutoCAD 2007 saving back to 2004. I use 2004, 2005 & 2006 in my office and we are getting all sorts of ARX errors, lockups, etc. especially when we insert blocks into drawings. The biggest problem is that we are losing CHPROP dialog boxes completely. CHPROP still works if you type it on the command line, but that just has limited features. How can we get the dialog box back?