I've been getting this error very recently:
The bus Razor is on (output to) certainly isn't silent, it's the master bus!
This has started happening when I open the project, since putting an instance of Camel Space in the FX bin of the channel that Razor is on. I've only just got this effects plugin, so was wondering if anybody else has seen this behaviour? Razor is running in Reaktor player, but hasn't caused any problems before now.
Cheers :-)