How exactly are you locking the slides?
If you are right-clicking and choosing "Lock Slide", you are unfortunately misunderstanding what this function actually does.
Helpful and Handy Links
In the Slide Manager, I'm selecting all slides and changing the Lock User
function to Yes:
Sorry, my bad. Somehow this post ended up in a filtered folder intended for Adobe Captivate posts. I thought you were referring to Adobe Captivate. I see you must be using Presenter.
No worries, thanks for trying, I'll go in and repost it.