/var/opt/m4/m4last.fw permission problem

When I try to download the blink sketch using the Arduino IDE on the desktop I get an error:

cp: cannot create regular file 'var/opt/m4/m4last.fw' : Permission denied.

This is because the file is owned by root and only has read permission for everybody else. Should I just delete it?

Why am I seeing this problem? I did load the blink sketch via the web interface. Does that perhaps run as root?

 

Yes deleting the file works. It gets recreated owned by udooer and then both the web interface demo and the IDE work. I think if you use the web demo first it will cause this bug.

 

BTW, why on earth does the blink sketch use 43K when it is running on an M4?

 

You'll find this problem every time you switch users and try to upload new firmware.

 

Thank you!