This is a known problem of Fruityloops which affects also Saurus and many plugins of other companies like z3ta. We don't know why Fruity does not "Use fixed size buffers" as a default setting, because our measurements have shown that all other hosts behave in this way.
We also recommed the use of RayBlaster v1.0.1 instead of v1.0. It offers better performance with aggressive soundcard latency settings which could also result in a click.