I created a slide presentation to present for an annual meeting of a plant society, but when I preview the slide show, some, only some of the slide dim out in a couple of seconds after appearing. They don't become completely dark, but are noticeably darker than when they first appear and darker than the original file, or as they appear in the slide sorter view or the normal view. And it is only happening with SOME of them, not all. I tried removing all transition times and am using fade with a mouse advance. Any ideas what is causing this?

Do the "dark" slides have a different custom layout?

Could there be an animation on the layout that darkens the background for example?

It would probably help if you could post an affected slide somewhere/

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Microsoft PowerPoint MVP 2007-2023
Free Advanced PowerPoint Tips and Tutorials

I just looked through again to see whether I could see a common thread and noticed that the slides that are doing that are the verticals and the slides with text only. All of the horizontal images are fine. Any suggestions were to post a slide?

Email me a slide, if i can't see the problem I'll post it on our server for others to look/

john ATSIGNHERE pptalchemy.co.uk

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Microsoft PowerPoint MVP 2007-2023
Free Advanced PowerPoint Tips and Tutorials

Thanks, I got the slides.

However I don't see any dimming with 2010 (32 bit) on Windows 7

Some things to look at.

I see you used the Template "Pulse" This is ancient and has changed since first offered. In 97 it animated and in most later versions it didn't. I can't see how it is affecting thing but maybe try something else instead of Pulse.

If (as you say) you have 64 bit Office this can cause all sorts of problems and is rarely a good idea. For me 32 bit always works better even on 64 bit systems. If you don't want to switch try File > Options > Advance Disable hardware graphics acceleration, see if that helps.

As agreed I have uploaded the file for others to look at!

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Microsoft PowerPoint MVP 2007-2023
Free Advanced PowerPoint Tips and Tutorials

I tried disabling hardware graphics acceleration first without effect. But then I tried changing from Pulse to Thatch for the design and the problem magically disappeared! Thank you, John! As you say, the Pulse is very old, and I have used it for a long time. I really like it, but it looks like I will have to move on. I can always change the colors to get that rich blue that I so like, but Thatch may grow on me (not literally). Thanks, again for your help.