I need help!.. my cakes slide on my cake boards. I have done everything I was taught. I covered my cake boards with freezer paper shiny side up. Like I was taught, smeared buttercream on my board plopped down my cake, and decorated. and everytime they slide across the board. I can tilt the cake every so slightly and there they go sliding. One lady I met in the cake department at Michael's told me to make my icing really thick. I tried that I even bought the Wilton paper to cover my board thinking the texture would possibly help... No my cake still slid.
Can anyone help me? What am I doing wrong?

I use RI instead of BC. I find that helps "glue" the cake onto the board better.

Thanks Maryak, I will try that on the cake I am making tomorrow.