OK, if Show/Hide has no effect it obviously isn't hidden text, but something
set not to print.
Have a look in Tools > Options > Print and make sure you have "Drawing
objects" checked. If you have text in text boxes, its printing will be
controlled by this setting.
While you are there, you could have a look at the other options and see if
it's something even more esoteric - for instance, "print data only for
forms" should be off.
Occasionally you get missing text because of a printer driver problem, so
you could also try selecting a different printer type (add a printer if you
need to) and if necessary visiting your printer manufacturer's web site for
updates.