All of a sudden my vanilla cake recipe is no longer rising and it's not moist. I bought new baking soda and baking powder - other than that it's a very basic recipe - flour butter sugar salt buttermilk, etc. 

Any suggestions as to why it wouldn't be rising? My chocolate cakes are doing just fine. 

Thoughts?

I bet something is off with the new baking soda and powder you bought.  Sometimes even if it's fresh on the label it might not agree with your oven.  Maybe try a different brand or change the ratio.