Primary Color Mode settings do not hold.

Whenever I create a new document and set Primary Color Mode to RGB, then create several new documents, eventually I turn off "Do not show this New Document Dialog box" anymore.

Primary color mode for any new document reverts back to CMYK.

I really need it to stick to RGB.

So I keep going to : Tools > Options > General > Show New Document dialog box  so that the dialog box shows, so that I can set it to RGB, but I don't want to keep seeing this dialog box.

Can you describe how to make RGB stick as the primary color mode?

thank you,