Xilinx FIR Filter output number of samples half of expected

[RadarRocket]

Trying to get a basic FIR decimation (by 2) filter implementation to work using the Xilinx FIR Compiler (V5) IP. The problem I'm having is the number of output samples is half of what I'm expecting to get. If I feed in 500 samples I'm only getting 125 samples. I tried changing the filter to a single rate type and got 250 samples instead of 500. Seems like every other sample is getting discarded for some reason even though I'm using handshaking.

I've been trying to get this to work for the past 3 days and haven't made any progress at all.. Please help!