why suddeny do the blue guidelines i've set in a document dissapear?

for many years i worked with a document into which i've set blue guidelines by dragging the lines in from the side and top rulers.  i use them to tell me where to place an image in the correct place for printing a document--it's a template.  suddenly, the blue Guidelines that I have set up, that have always been there, are no longer there. Twice now I have re-set them up  and then saved the document. When I open the document the next time the blue guidelines are gone. What's going on here?

 the attached image shows what they are supposed to look like

I'm using PS six on Mac OS 14