Some slides don't show in Photoshop Elements 8 Storyboard

Thanks for reporting back your solution.  In future, you can change the dimensions of multiple files in PSE using the File>Process Multiple Files menu dialog.  The oldest version of Elements I currently have on my computer is version 10 but it is probably the same in version 8.

BUT, you say you chose a 16:9 aspect ration for uploading to YouTube.  However any wmv video file that you output from version 8 will be a different aspect ratio.  Here are the output options from version 10 which do not contain any 16:9 (HD) ratios.

I don't know how Youtube deals with this issue.  It will either stretch the video or create black bars at the sides of the HD video. 

Hi,

     I figured out why some of my slides were not showing up when I output my Photoshop Elements 8 slideshow to a WMV file.

     It had to do with pixel dimensions.  When I started putting my slideshow together, I set the dimensions for each slide at 16 inches wide by 9 inches high, because as I understand it, YouTube wants a 16 by 9 ratio.

     After I worked on each slide and saved it as a JPG file, I saved it with Image Quality 5, a medium setting.  I figured:  not too big and not too small.

     For most slides that worked well, but some slides were saved with huge pixel dimensions, such as 16000 by 9000.  I don't understand why that happens.  Those slides would not show up on the Photoshop Elements 8 Organizer Slideshow storyboard -- they appeared as a blue screen there (I had picked blue as my background color).  The same slides DID show up when I clicked on the Play button, so I put up with the inconvenience until I finished the slideshow.

     But then, when I "Output" the slideshow as a WMV file, those same slides showed up as blue screens.

     I tried saving the slides as PNG files, BMP files, you name it.  Then, by chance, when I was searching through the folder that all these slides were in (using Large Icon mode), I happened to hover over one of the problem slides.  I noticed "Dimensions: 16000 x 9000", and I wondered what the dimensions were on the slides that worked properly.  They were much smaller. One was 7077 x 3981;  one was 471 x 265.

     So, I tried to figure out how to reduce the number of pixels for each problem slide.  I found one simple way -- using Microsoft Photos.  In the folder containing all the slides, double-click on the slide's icon.  It will appear in Microsoft Photos (unless you have somehow changed your preferences).  Click on the three horizontal dots at the upper right of the screen.  Click on "Resize".  Click on Option L -- "Best for viewing -- 4MP."  Select the proper folder;  rename the file;  click on Save.

     The slides I did this to show up on the storyboard.  I first tested outputting four of them to a WMV file, and that worked.  And now I have just output the entire slideshow, and it works!

     There is a way to reduce pixel dimensions in Photoshop Elements 8 Editor:  Click on Image > Resize > Image Size.  I found this method trickier than Microsoft Photos.

     Sometime in the next few days I will upload my slideshow "How Old Is Ann?" to YouTube.  Bored people everywhere will be able to decide whether my efforts were worth it.

What is the format of the images that don't show up in the slideshow?  Do they appear OK in the Organizer?  Do the same images fail to show up if you were to start a new slideshow?

The Organizer's slideshow feature changed several versions ago.  You are now only able to use a template for the slideshow, and there is no ability to time the images as you have done in your slideshow.