In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Could it be that you have forgotten to put in a resonator?
Generally, you remove it to program and the SXKey provides the clock.
So it must be replaced.

Alternately, both resonators or just one is hanging up due to the wrong fuse setting.  Try to find the setting that requies the least amount of power to properly drive your resonator or crystal.

It certainly would help to verify one at a time by connecting to a reliable serial port.

Are you really clocking at 50Khz? [Your software says 50Mhz]  
At 50Khz, it seems that you are too slow for a resonator.  If you are relying on the internal RC circuit or an external RC circuit, it is not stable enough for serial communications.  As the temperature rises, it will drift up to 7% and serial needs no more than 3% drift at best.

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