I have a weird intermittent power supply issue with the IO Carrier Card for the MicroZed.
When powering up the carrier card with no MicroZed installed, the 3.3v at TP10 is gone or intermittent... sometimes it's about 20Hz, sometimes it's about 2Hz; you can see the user LEDs blink.
On the CRO you can see the waveform of the 3.3 power supply coming up to full horizontal @ 3.3 and then decaying off.
Unplugging barrel or flicking switch; sometimes the same, sometimes different period, sometimes completely fine and stable 3.3v.
Hard to tell, but when the MicroZed is installed it doesn't try and power up in these "weird" states... you can tell if the LEDs come up on the MicroZed it will boot.
It doesn't appear to be a mechanical thing with the switch or the barrel connector... hard to prove without desoldering those.
Right now, it's chugging away with MicroZed installed, merrily running a blinky LEDs on the IOCC with no USB plugged in, so supply is carrying the whole show happily.