Hi - I´ve used Arduino Uno for 2 months, it´s worked just fine.
Then, possibly after an update, suddenly sketches do not upload. Being afraid I´d "killed it" I bought a new Uno. And just to test that I uploaded the Blink sketch. Worked fine. Or perhaps it was uploaded already.
Then everytime I power up the Blink runs, but nothing uploads (Tx and Rx dead). And it was probably the same w/ the old board, only there maybe a different sketch was stuck.
And everytime I start the IDE a previous sketch is loaded, instead of an empty.
I run W10/64 and 1.8.10.
N b: The port setting is OK according to the program. I´ve reset several times. I tried it out on another computer, with an older program version (1.8.9) that used to work. Restarted the computers. Uninstalled and reinstalled the program.
Realising two boards or computers can´t be erratic, there must be a software problem.