I'm having to fix a MKR1000 project that worked fine since Feb 2019. A conversion from a solderless breadboard to a soldered one broke the MKR1000 (our fault) resulted in a second MKR that got purchased at about the same time getting programmed. That was when the changes in the updated WiFi101 library were noticed. And I stick to my guns they broke the code examples out there.We've not been able to step debug these boards in the Arduino IDE. But I've not updated it beyond downloading new libraries.I work with STM32s and PICs. The Arduino should be a convenient option for one-off prototypes. With code examples that work.