When i have a slideshow, which is made smaller then the original picture or maximum slideshow size it doesn't show the full picture when I click on it.
I have in a posting the following code :
[wppa type="slideonly" album="40" size="200" align="left"][/wppa]
The maximum slideshow size in the settings (Tabel I B1,2) is 800x600
and the Table VI 8 is set to lightbox. According to the description in this table (Slideshow fullsize link) I would suspect to open the full picture and not a lightbox with the same size as the slideshow.
Example post/slideshow: http://sjomar.idef1x.net/2011/05/finale/
When you click on the slideshow you see that it's opening the thumb.
edit: I am using version 4.7.19 of wppa