Are you on version 7.0.6 or 7.0.7? If so start by upgrading to one of those two versions. 7.0.6 can be achieved by using the update feature in the Help menu of Presenter, and 7.0.7 can be achieved by using the updates found at, http://www.adobe.com/support/downloads/product.jsp?product=153&platform=Windows, and the instructions found at http://helpx.adobe.com/presenter.html
With that done, you may try experimenting with publishing the presentation from a PPT file instead of a PPTX (or PPTX instead of PPT), and see if that helps resolve the problem.
Currently I have 7.0.6 build 7604; I am going to try running 7.0.7. Hopefully this will work.
And, since that post, you can also try upgrading to Presenter 8, and see if that makes a difference.
Let us know if it does get resolved.
perhaps a bug related issue?
Shoud I go to 7.06 or 8?
You can go to 7.0.6 or 7.0.7 for free. Presenter 8 is a paid upgrade.
I'm not aware of this being a bug in 7.0.5, but it certainly could have been. I would go to 7.0.6 and see if the issue is fixed. Also try the PPT instead of PPTX trick. Then if that doesn't work, I'd try 7.0.7.
You can always try the Trial versio of Presenter 8, but you would have to uninstall Presenter 7 to do that.
do you have specific reasons why not 7.7?
Because it requires an uninstall and reinstall. So going to 7.0.6 is an easier step to start with, and I prefer to start with the easy stuff!
However if you are working with Connect 8.1 or newer, then you should be on 7.0.7 anyhow, as it is required to work propperly in live meeting rooms.
I did upgrade to the 7.0.7; however, I am now running into screens duplicating on top of each other. Any ideas?