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I'm having issues with sysex.

DYI 56i; latest firmware; 644; latest MDM; W10 (Same issue on W7).
If I click any type of send it will time out immediately.
SendAll will get stuck at 87% and then time out.
"Get" doesn't do anything,
If I send config from MD sysex will go to green (OK) and whatever I've changed in the MD menu changes is MDM.

I can see data arriving at the atmega pin 14 Scope), the LED flashes when I do sendAll.

I'm using a midi to USB converter cable (http://www.sweetwater.com/store/detail/USBtoMIDI)

Anyone any ideas?

Forgot to mention:
It's on a powered usb hub
and I've tried several settings on Sysex delay.

Off top of my head:
1. Replace R17 4k7 resistor with 470 Ohm - 1k resistor.
2. Problems on the board: bad soldering, too much flux end etc.
3. The USB converter you're using is not passing SysEx MIDI correctly. Use MegaDrum internal USB interface.