Do you have "Import Workspaces from Projects "Checked?
Yes it is checked
Just some more information:
I opened a new project today and it opened in my custom editing workspace. After I had done my import and placed clips on the timeline I changes to the Color correcting WS.
I finished CC and went back to My Editing WS saved and closed the program.
I just opened it again and it opened into the color correcting WS.
Uncheck "Import Workspaces from Projects "
The last used workspace is being saved with your project and you are asking PPRo to open it that way.
I was wrong about the use of that.
There must be a bug because even when I saved the project while in my editing WS it still opened into Color Correcting. But today I did as you suggested I unchecked "Import Workspaces from Projects " saved while in my edit WS closed then reopened and it opened in my editing as it should.
Have you by any chance, assigned a different target for MY DOCUMENTS? I previously had a problem in that my workspaces were not being saved after I quit a session with Premiero Pro. What I finally realized that Premiere Pro was saving the preferences to the standard target for MY DOCUMENTS rather than the target I had established. (I wanted all my created files to go to a NAS that backed up the files via RAID.) The behavior suggested that Premiere Pro had been hardcoded to C:\users\documents etc, etc.
Restoring the default target restored proper Premiere operation. I created a separate NAS folder MYDOCS and manually use that folder in lieu of MY DOCUMENTS