anyone out using 64 bit enabled without the forementioned problems in x3c

For the Console Emulator (mono) and Spectrum Analyzer (ProChannel EQ), no. This has been acknowledged by the bakers several times. http://forum.cakewalk.com/FindPost/2935729
 
Disabling the 64-bit Double Precision Engine will not have a noticeable effect on anything. Please do not confuse 64-bit DPE with 64-bit applications (they are different).

Just disable with X3C (or keep enabled if you really must) and wait for X3D. Don't waste your time thinking about it. Cheers :)

I haven't used that option since I stabilized X1. I remember it was one of the "try this" ideas that were floating around. Shut it off and never thought about it again. Maybe that's why I've had no big problems since then.

It's off by default so I leave it that way, however, I have tried the CE with that option on just to test and did not hear any buzz or hum.    Weird, huh?