Hi guys - I've had mine for about two weeks, and the night before last I turned the unit on and had the identical symptom. No envelope LED blinky; none. Turned it on last night; same results.
Prior to this I was patching between the MB and Eurorack, but do not think this had any adverse effect in regards to what I am experiencing with the MB.
I also ran the software on a netbook with the MB connected and played with aftertouch settings and whatnot.
This is a really neat little synth, and it is unfortunate that so many are having issues. I hate the feeling that I should have just sprung for more modules - but I really want to LOVE the MB. I really want it to shine.... or in this case -- blink.
If it is likely just a loose cable, then I'll just pop it open and reconnect. (Bruno?)
In the last few months I've built numerous Shruthi-1 filters, analogue sequencer, effects boxes, etc... so, Bruno, get as techy as you like with possible solutions - I'll just tear it open and resolve. Please lemme know, sir. Thanks.