As a heads up - I was having the same bang your head against the wall problem as Stanszal trying to get the "temporary" capacitor fix to work. Turns out that in addition to the capacitor being needed, there may be issues with the header connections on some of the boards. None of the GND\RESET connections worked with the capacitor thru the bottom plate. Pulled the bottom plate and plugged the cap right into the MBus header GND\RST on the system board and it's worked every time - plan is to solder the CAP patch once I get a small one.
So - besides the capacitor issue (I really hope the fabricator reads this stuff and comes up with a fix), you all need to be aware as to why soldered boards are much preferred over solderless breadboards and header stacks. Less likely to have poor connections via solder. I love the compactness and modularity of the M5Stack (part of why I picked one up to play with) but this just underscores that you need to be wary of the header pin connections on the modules. The short pins and sockets and tight tolerances to make this what it is looks prone to connection problems.