Refer to this Question: MOSFET Gate Driver Simulation ProblemMOSFET Gate Driver Simulation Problem
My Gate Driver datasheet: http://www.irf.com/product-info/datasheets/data/ir2104.pdf
May I ask why there are two capacitors instead of just one hooked up in parallel between Vb and Vs? I am also using a gate driver to drive the FETs of my synchronous buck converter, and I am having similar trouble turning on the high-side FET. I also have everything hooked up as in the IR2014 datasheet (which I've also attached) except I'm not using any resistors between HO (LO) and the high-side (low-side) FET gate. Maybe this could be my problem, but I can't figure out why that would be so.