If you find one or more of the DisplayLink connected screens are going blank for about one second, then coming back on, and the windows on the DisplayLink display have not moved to another display, it is probably caused by the monitor losing sync with the video output from the DisplayLink video output. This can be caused by long, or poor quality video cables. Video cables are no different to any other cables in terms of quality. Poor quality cables can cause:

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USB 3.0 DVI Display Adapter by j5create VGA/DVI HDMI 1080p HD 2048 x 1152 Available USB 2.0 Port Compatible with Windows 8.1/8 / 7/ Windows Vista, macOS 10.6/10.7/10.8 and More. May 03, 2018 It's J5create's responsibility to supply working drivers/software for their device. From what it looks like J5 is trying to resolve the issue and has been in contact with Apple. The below is from J5's website: We are aware that the macOS 10.13.4 update is temporarily not supported on the j5 USB display adapters. Oct 04, 2019 (The process should be the same for the USB2-E1000 based on the AX88178 chip, though this adapter uses a different driver version, found here: USB2-E1000 AX88178 macOS Catalina Drivers v2.3.0) Step 1: After downloading, open the folder downloaded and run the AX88179178Av2.15.0beta1.pkg file.

• Signal degradation
• Video flicker
• Video distortion

If you are seeing such an issue please check if swapping your video cable for another resolves the issue.
Surprisingly, we have also seen this issue connected to gas lift office chairs. When people stand or sit on gas lift chairs, they can generate an EMI spike which is picked up on the video cables, causing a loss of sync. If you have users complaining about displays randomly flickering it could actually be connected to people sitting on gas lift chairs. Again swapping video cables, especially for ones with magnetic ferrite ring on the cable, can eliminate this problem. There is even a white paper about this issue.
Issues such as those mentioned above are particularly evident in video cable converters.
If you are using a DisplayPort to HDMI, DisplayPort to DVI, DisplayPort to VGA or HDMI to VGA cable and are having issues we recommend using an active video adapter in conjunction with a video cable as illustrated below:
DisplayPort output > DisplayPort to HDMI active adapter > HDMI to HDMI cable > Monitor input
DisplayPort output > DisplayPort to DVI active adapter > DVI to DVI cable > Monitor input
DisplayPort output > DisplayPort to VGA active adapter > VGA to VGA cable > Monitor input
HDMI output > HDMI to VGA active adapter > VGA to VGA cable > Monitor input

What is the difference between active and passive?

Active cables and adapters contain have their own built in chip which converts the video signal from say DisplayPort to HDMI, they also convert the digital DisplayPort or HDMI signal to the analogue VGA signal
Passive cables and adapters do not have such a conversion chip built in. Instead they rely on the source to do the conversion. Unless the source has the ability to output analogue over DisplayPort or HDMI then an active adapter is required for VGA output.

What active adapters do you recommend?

We cannot recommend one over another but we do regularly use the following in our test lab:
DisplayPort to HDMI adapter:

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• HP
  
• Fujitsu
  
• Startech
  
• Lindy
  

DisplayPort to DVI

• HP
  
• Lindy
  

DisplayPort to VGA

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• Dell
  
• HP
  
• Lindy
  

HDMI to VGA

• Dell
  

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