Using version 0.1.12c, After running pico-8 once(pico-8.exe), closing the program, then re-running (pico-8.exe), the escape key to get to the editor no longer functions. Also, even after a fresh install, changing the carts folder in config.txt to anything but the default breaks it as well.
I have to reinstall for each use. There is no error in log file either.
A Shift-Escape key combo works after the standard escape stops working fortunately. Perhaps this is just a documentation update needed?