I've used ganache many, many times and I've never refridgerated it once in a cake. I've fill cupcakes the day before and a whole bunch of people at church the next day ate them. To my knowledge nobody got sick or died (me included!) I've made many cakes that have sat out for a day or two before being fully consumed and they've always been fine. I LOVE ganache!
There are heaps of posts on here lately about ganache - try using the search function - I know I have contributed to LOTS
I refridgerate a cake that is covered in ganache, the one time I didn't it started melting at night, and was sliding off of cake
It was ok, but now I just pop in fridge. You dont have to though! Its fine out I think.
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