Stickie doesn't allow typing in it...

I have one Stickie now that won't allow me to type in it !!!
Nothing from the keyboard works.

I can highlight text with the mouse, but none of the functions work, Bold, Highlight, Color etc.

Any ideas what could cause a Stickie that used to work, stop working?

All my other (dozens) of Stickies are working.

Most likely you have "locked" it.

Right click on title bar, and check contextual menu : I guess that you can see in this menu "Unlock content" : clic on it to unlock your sticky

It might also be an image note: https://www.zhornsoftware.co.uk/support/kb.pl?q=00082

Tom