Edit Component fails to open on Parent Symbols

[Designer5446]

I'm having a problem editing Parent components in project drawings.  Whether the files are checked out of Vault Pro or not; whether I'm logged into Vault Pro or not logged in; whether the drawing is in the active project or not; whether the Project and drawings are in Vault at all - When I invoke Edit Component on a Parent Symbol, I get the following message:

"[All/Center/Dynamic/Extents/Previous/Scale/Window/Object] <real time>: _PREV
Extracting item numbers in use . . .; error: quit / exit abort"

When editing Child components - no problem.  The Edit Component dialog box comes up as expected.

Background:

-Using AutoCAD Electrical 2019, Vault Professional 2019

- The Project file and all Project drawings are checked-out and in the working folder.  All files are marked read/write.

- The Project .wdp references the correct ENV file.  All file paths in the ENV point to the correct working folders.

- All Support file search paths correspond to the paths in the ENV file.

- Parent symbols contain the required attributes for AutoCAD Electrical.  Symbols that I've created months and years ago didn't have this problem, until recently.

Any insight is appreciated.

Thanks!

[jseefdrumr]

Weird, specifically wonky things like this are usually fixed by resetting to defaults. This is found under the Start Menu in Windows 10. If that doesn't work, perform a Repair of your software. This is done by going through the motions as if you want to uninstall; somewhere along the way you'll see the option to try a Repair.

If neither of those work, post back.

Be sure to back up any customizations you're using first.

[ramesh.kambang]

Try the following steps:

1. Windows 10 full updates
2. restart windows
3. Try on demo project drawings.
4. reset acade 
5. last option, clean install acade