@ptillisch 2.0.17 was the only core that gave no errors with the libraries I use since 3.2.0. especially WIFI and Neopixel. for the last and I wrote my own for the SK6812 and WS2812 LEDs.
I suspect one of the Serial terminal apps (YAT or Coolterm) changed something in the Serial port settings of W11.
So I last I looked for differences in the boards.txt setting DTR and RTS. That was long a problem setting (true/false) with the ESP32 C3 and S3 MCU’s and the Serial terminal. Changing true to false solved that these boards did not work in the serial terminal
What is happening now is something that can only be solved by the developers. Something deep in my COM port settings in W11 is corrupted and not properly reset by 2.0.17.
Maybe is is time for the Arduino team to start with core 3.3.0 as an upgrade. The Nano ESP32 is hard to find between the hundreds of ESP32 boards in the official Boards list.
maybe somebody can give me a hint to get W11 and 2.0.17 running properly again