I've attached 2 versions of the scene. They're both the same but one upload has 1 frame of cache files, the other has 10.
9mb
1 frame (frame 300)
https://dl.dropboxusercontent.com/u/7680428/Putty01.rar
100mb
10 frame (frames 290 - 300)
https://dl.dropboxusercontent.com/u/7680428/Putty02.rar
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Fire (and preview) only works with me when I initially build the mesh. If I change frame a and go back it crashes. When I load Rf and run fire, it crashes. I have to rebuild the mesh but I can't change frame again.
I've set the particles to not render but I've forgotten to turn the rendering of the meshes back on.
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While you're at it, would it be possible for you to try and get the same look of the legacy mesh with a RK mesh for both the emitters? I'm having a bit of difficulty getting to to look the same.
Many thanks.
This is what an initial test looks like rendered. Quite a nice effect

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