I use Magento ver. 18.104.22.168 and Webshopapps Matrix Rates extension.
In "Shopping Cart Price Rule" , i've set the products in specified categories for shipping free, it's ok, no pb.
And in admin panel, system->configuration->sales->shipping methods->Webshopapps Matrix Rates
Only Display Free Shipping --> i choosed "no", i want to show all the shipping methods, not only free shipping, but when i checked out, in "Select Shipping Method", it only show free shipping.
I did the same setup in version Magento ver. 22.214.171.124, it works, i don't know why in the Magento ver. 126.96.36.199, the other shipping methodes don't show.
Any one konw the issue? Please help.
I know this is not going to help fix your issue but i find in these situations, going directly to the developers is a better option. Webshopapps will be more than happy to offer assitance and they know their module better than anyone.