Probably I’m not the only one to have found this.
WORKAROUND:
window > load layout > select Default Editor Layout to regen your DefaultLayout.ini
Seems bulletproof as an interim fix until 4.27
Hello,
We’ve made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.
Thanks
Not so much a bug as a workaround for a bug, but thank you Marianna, I will bear the bug reporting structure in mind.