Hi @mcmchris do you mean you get crash/fault even when using the official mbedos libraries from the IDE's Board support package? could you share the version of the board support package and the version of the Arduino IDE? how about using the latest Arduino IDE and board support package for Nicla Sense? for the precompiled libraries, I believe there have been a lot of changes which might have broken the compabilities. some quick notes for helping you with the troubleshooting: if your sketch uses BLE, it will try to allocate a big chunk of RAM memory for the BLE stack and when that allocation fails, you get a crash. in this case, you could try to minimize the memory consumption in your sketch, for example minimize the size of global variables, arraies, etc. if your sketch does not require BLE, you could disable the BLE (I can share how if you want) and this should resolve the issue very easily.
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