I definitely converted them because they were 1kb .wavs and then I clicked the DigiPro button and they were transferred into 6kb .syx files.
I am using the latest C6 (1.4, I just checked) and I will definitely try with the factory waveforms for a test. I also e-mailed Elektron about it myself and they're asking for the .wav file which is a little over 550 samples which should be well underneath the 16384 sample length that I have read about on this board.
If you have prepared waveforms yourself, could you walk me through the process, so maybe I can convert these into a proper length just incase? Mine are definitely a single cycle, and as I mention 1kb .wav, maybe .aiff work better? Maybe I need to re-export them from a DAW? I don't know, it's pretty frustrating. Haha.