Hello felmue,
the UIFlow screen appear on the paper display together with the lines.
The screen is working fine except the persistent lines. The vertikal line got another color, it is more black and a bit shiny.

No, the lines persist.
Flashed the most recent uiFlow Image

Hi,
since 1 month i got a m5Paper and I just ran the factory Image and some UIFlow tests.
Yesterday, after a few days i want to do some Arduino stuff with my m5Paper. I refreshed the screen and some lines are still there.
See Pic:

I tried a complete refresh and changed the color to black and back to white.

Those line are still persistent.

Got somebody a similar issue?