Thanks for that and possible solution.
However don't want it to be an ongoing issue for future client slideshows from the camera, so have done some testing.
Unsure at mo wether the camera/card is the problem so seeking clarification from Canon re camera orientation and SDHC output.
Somehow I doubt it, because portrait orientation works fine with all the photo apps I am using, along with web/print output.
In meantime tried importing same pics into iPhoto, created album and used it for the slideshow. Portrait orientation fine.
So then set up new Toast DVD project and dragged original photos straight to the Video DVD content area and all portrait pics were landscape.
Seems that when using a SDHC card with a Canon 60D camera, it does not allow for portrait orientation in Toast 11.
According to the Toast 11 manual, pp88, clause 5, this is standard procedure.
5. Add photo or video files to the disc by dragging and dropping them into the Content Area from your hard disk or the Media Browser.
Don't know where the problem is - ie Toast or the camera/card.
Whatever - seems iPhoto has driver for the 60D and recognises portrait orientation and acceptable for Toast slideshow.
So will continue to use iPhoto as solution until I find or hear of alternative.