Changed Category order and all Products disappeared from Front End

[Thing]

Hi

I have a virtuemart installation in a Joomla site. My VirtueMart installation is VirtueMart 3.0.6. Joomla version is 3.4.0.
I had everything working and then the client wanted me to change the Category ordering so that it display alphabetically.
As soon as I changed the ordering, all products disappeared from the front end - even creating a new product doesn't show up.
I searched the web for solutions (shopper's groups, multi-language, etc.) but nothing I do/check seems broken.

Please help advise, I am new to Virtuemart and this is for a client - so I don't even know where to look and they are obviously freaking out because they have no products in their store.

[Thing]

In addition, if it helps, the URL to the live site is www.getfloss.ca

[jenkinhill]

Not possible to know exactly what you have done, but the first thing to do when debugging an issue is to completely turn off SEF in Joomla and VirtueMart.