I have pse 7 and 8 and think there is a tiny difference in the tools. Did you try resetting the tools?
I have been having issue with my PSE 8 and I have text and elements disappear when I click the green arrow to confirm. I normally have to save, close out of everything and reopen to get it to work right!
Gremlins in computers are so annoying!
Hope someone else comes along that might have some real help for you!