Mike's right. This IS weird.
If you add the link to other presentation on a normal shape, it behaves as you
describe it, Sonia.
If you add the link to other presentation on an action button (which is what Mike
did) then Insert Hyperlink (or rightclick, Edit Hyperlink) brings up the action
settings dialog box.
Weirder yet:
Add the link to a rectangle via Action Settings.
Verify that you can get the Hyperlink dialog by Rightclick/Edit Hyperlink.
Now go back to the action settings dialog and put a check next to "Highlight Click"
and OK.
Now try getting to the Hyperlink dialog box you just visited.
For extra bonus points, tell me what they were smoking.
But at least that's a partial answer for Mike, if a weird one.
Use a rectangle instead of an action button.
Apply the desired action setting but DON'T choose Highlight Click.
Then rightclick and choose Edit Hyperlink, change the screen tip.
Finally, if you want some user feedback when the "button" is clicked, go back to
Action Settings and put a check next to Highlight Click. The screen tip will still
work.
I say Mike gets the Electric Beanie for uncovering the weirdo bug of the week.