@felmue
Thanks for taking an interest. I am using the default libraries and samples without any mods or "improvements on my part"

Arduino: 1.8.15 (Windows 7), Board: "M5Stack-Core2, Enabled, Default (2 x 6.5 MB app, 3.6 MB SPIFFS), 240MHz (WiFi/BT), 115200, None"

In file included from D:\My Documents\Arduino\libraries\M5Core2\src/M5Core2.h:76,
from
D:\My Documents\Arduino\libraries\M5Core2\examples\Basics\display\display.ino:13:
D:\My Documents\Arduino\libraries\M5Core2\src/M5Display.h:117:12:
error: 'vector' in namespace 'std' does not name a template type
std::vector<DisplayState> _displayStateStack; ^~~~~~ D:\My Documents\Arduino\libraries\M5Core2
etc etc

The typo was just in this post.
The include is definitely #include <M5Core2.h, and the compile error is
" Error compiling for board M5Stack-Core2"

@felmue

Have a newly developed Arduino M5Core2 problem.
I hope the following is clear enough.
Uflow sketches for Core2 and stick c plus ..... NO PROBLEMS
Arduino programs for Stick C plus ..... NO PROBLEMS
Arduino for Core2 with #include <M5Stack.h> compile and run , but no display on lcd
Arduino for Core2 with #include <M5core2.h> = Error compiling for board M5Stack-Core2.
Have reinstalled all Arduino libraries and M5 software
Any help would be very appreciated

Have now tried everything (arduino,flow, MicroPython.
The best I got , was a very faint high pitched squeak.
Isn't this device supposed the have a buzzer?
I have no such problems with the core2.
Would welcome any help, before sending it back.

Or some other method wifi or usb (something lik adb)?

NOT! In the Desktop version

Never had a problem with the core basic (flow/python/arduino)
How do I program Buzzer/Beep sounds in core2.
Cannot find the methods in the various libraries
Thanks

Help
Never had a problem with the core basic (flow/python/arduino)
How do I program Buzzer/Beep sounds in core2.
Cannot find the methods in the various libraries
Thanks