Hello and Happy New Year Anshul,
Thank you for your response. It means a great deat that you will go to thr trouble to do so.
For some unknown reason the grayed out "About Photoshop..." started appearing normally.
I don't know what I may have done other than to restart Photoshop from the finder and also restart my computer to cause this to start behaving normally.
I am now running Photoshop 26.6 and macOS Sequoia 15.2.All is well.
Best regards and thanks again,
Stan