Sjaak likes to design (and build) PCBs in his spare time. This has a big downside as he has a busy daytime job, which makes him a bit less focussed during the design process. He used a small crystal of which he didn’t had a proper footprint of. No problem as it is a few clicks away in eagle. Unfortunately the datasheet he used had two versions of the crystal; one ‘regular’ and a reversed one.
Sjaak is recently being acused of being a soldering alien and he gets his trusty old soldering iron and removed the crystal, flipped it over and resolder it using some small wires. After the quick fix it worked as expected. The board has some other minor nuisances (prolly because of the late night design) so expect a new revision soon. It is BTW an ESP8266 breakout, which uses a custom 1200×1200 mil PCB (loosely based on 30x30mm SOB). Using mils instead of mm make it easier to place imperial stuff more symmetrical.