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I've read all this talk about bluetooth and all that. Bottom line, since my Mac Pro acts the same way with no bluetooth even installed, I strongly believe it is simply something wrong with Remote Buddy in it's current state. The old preview version works 100% fine, the new one does not. I just am not comfortable accepting that it's all Apple's fault somehow.
I tested this on 4 totally different macs I have (new 17" macbook pro, original black macbook, G4 macmini, and dual 2.66 Mac Pro). The minute Remote Buddy was activated, my network connection went down the tubes, wireless, wired, doesn't matter, bluetooth on, off, doesn't matter.
For now, I'm just using the old version, and bummed because I can't do the Ajax Remote part.
Fingers crossed that sometime in months to come something will be changed somewhere that gets it back to working.
Good luck...if I figure out any other elements as I keep testing my macs with various things, I'll post here for informational purposes.