* Read through these online documents =
U4919DW PC Requirements and Supported Configuration
U4919DW Usage and Troubleshooting Guide

* What specific PC model?

* Exactly how is the PC connecting to the U4919DW? Examples you should be testing ONE at a time =
PC HDMI out port --> U4919DW HDMI to HDMI cable --> U4919DW HDMI #1 in port

PC HDMI out port --> U4919DW HDMI to HDMI cable --> U4919DW HDMI #2 in port

PC DP out port --> U4919DW DP to DP cable --> U4919DW DP in port

PC USB Type-C out port --> U4919DW USB Type-C cable --> U4919DW USB Type-C in port

* When both PC and U4919DW are on, press the U4919DW #5 Menu button (page 42)
* Go to Others
* Choose Factory Reset, Reset all settings to the factory preset values
* Exit the Menu

* Right click the Windows desktop
* Click Display Settings
* Resolution should be 5120x1440 (Recommended) (5K 5120x1440 60Hz, 32:9 resolution)

* Click Advanced display settings. Fill in the data you see =
- Desktop resolution ?
- Active signal resolution ?
- Refresh rate (Hz) ?
- Bit depth ?
- Color Format ?
- Color space ?

I'm having the same problem but mainly for YouTube videos at 1440p or higher resolution only and when the scroll bar mininizes. The blurry issue seems to go away after I disable Intel UHD Graphics 620 through the Device Manager window but it comes back when I re-enable it which leads me to believe that it might be caused by the GPU.

Hi @Amir-Terani , I wasn't able to permanently resolve it. My workaround so far has been to install a free application called OBS studio and leave the app open and minimized which fixes the issue. The OBS Studio app records the screen.

Hi @Dweads & @kyexz, Did you ever resolve this? I'm having the same issue and none of Dell Support suggestions have helped.

If you have any more info, please let me know.
Thank you.
@-