Repeated "crash" noise upon startup

Hi everyone. I use reaper for midi playback only. But I get the "crash " noise every time that I start reaper. I use it one gigs, so I have to remember to turn the volume on my steinberg ur44, whitch turns down the warmup music. I would like to avoid this.
I have all the vsts' running through a master bus.
Please help!
Thanks

Repeated "crash" noise upon startup