AutoCAD Plant 3D

[#1]

I'm getting an endless loop on the Piping Connections - Optional Mismatch msgbox (screen shot attached).   All options including cancel and "X out" do not work, nor do ESC, Enter, or other keyboard strokes.  Anyone have a fix without Task Manager End Process?

Thanks,
DGrant

[#2 · Accepted solution]

A solution for Windows 7 users is to switch to "Drawing 1" from the Windows status bar when Plant 3D is not the current or active application. The msgbox, which is modal (meaning you can't start another activity until the msgbox closes) will still appear, but the cancel option works.  You can then switch back to your project drawing. 

Drawing 1 is loaded each time Plant 3D starts up.  I recommend keeping it loaded in the background.