dsyleixa:
having installed IDE 1.8.8., the IDE always starts with a new (empty) file, not with the latest working file as before (1.8.5).
How can I make 1.8.8 to automatically load the latest opened file again?
This is a known issue with Arduino IDE 1.8.8. Luckily, the bug has already been fixed and there is a new IDE version now 1.8.9. Please update to Arduino IDE 1.8.9.