Strange blinking line at top of 7" screen

@digitalmouse wrote:

My Raspberry Pi 7" Touchscreen Display arrived a few days ago, with Jade cover.
Pimoroni Ltd parcel number 15505356711121
order #RASPI-24377 via Pi Swag

Got it up and running with little fuss (after upgrading the firmware and flipping the image right-side up) and appears to work quite well in terminal/text mode, but has an annoying white bar that blinks along the the top of the screen when i use the GUI (via startx). See video link for 'live demonstration': https://youtu.be/YCx9pve5RyI

Touch events seem to work, and I got the right-click (holding finger down a little longer) trick working - as seen in the video.

Anything I should be looking at? Almost get the impression it's running at too high a resolution, but wanted to post my concerns here before I started tinkering with config files.

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