Hi Bob,
I found this to be a problem too and did some googling and found an answer. The sectionplane (and related) commands will not work in the Mechanical profile <<ACADMPP>> since they are AutoCAD Vanilla commands. If you load the Vanilla profile <<VANILLA>>, these commands will work. Type Options -> Profiles tab (to switch profiles)
Autodesk shouldn't have included these commands on the ribbon when you are in the Mechanical profile...I hope they read this...but whatever.
If you find having to switch between profiles annoying like I do, there is a registry fix to enable "Vanilla" commands in the Mechanical profile.
Try the following:
Click the Start menu -> Run
Type: regedit
Locate the following path:
(Note: Your path may be slightly different depending on your version of AutoCAD Mechanical)
HKEY_CURRENT_USER -> Software -> Autodesk -> AutoCAD -> R18.2 -> ACAD-A005:409 -> Profiles -> <<ACADMMP>>
On the right you should see a key called "DisableAcadSection"
Double click on this key and change the value from 1 to 0
Click OK
The next time you start AutoCAD Mechanical, the "Vanilla" commands should work.
Hope this helps.
Vicki
