Hi Ruth
The latest products, is just a cut down version of the all_products feed. all it does is put them in order of the time they were added to the site, and then pick the top XX number of the top.

So what must be happening is the top 25 items are OK, and one of the products further down the list is having issues. Probably something like a special character in the product or category title, maybe a special character in the description, but that shouldn't be an issue any more really. Or the ID number starts duplicating for some reason.

Can i ask, do you have you multiple shopper groups or multiple Tax Codes set up?

The SEF URL is built into the Mambot, as we never thought that anybody would want it removed. So it is part of a lot of the coding I'm afraid.

I think for the next update, ill try and see if i can add in an option
- Use SEF
- Use Standard Joomla/VM URLs

All the best
Ian