White user interface Avast Free Anti-virus

As many have already posted on similar problem, when opening Avast from desktop icon or via start menu all we get is a blank white box.
If We right click on the tray icon we can access the subscription information, troubleshooting and componets menu but this dosent allow access to the scanning options usually shown on the main user interface.
Have uninstalled/reinstalled Avast multiple times and also followed the instructions to clean install but still have this problem.
OS is Windows 10 and avast version is Anti-Virus fre version 18.6.2349.

Repair and reboot >> https://support.avast.com/en-eu/article/Repair-Antivirus

FAQ >> https://support.avast.com/

Sorry should of made it clearer already done that and made no difference, the Ui shows up when uninstalling/repairing no problem but will not show up correctly when accessing via desktop/start menu icon

  • OS…? (32/64 Bit…? - which SP/Build…?)
  • Other security related software installed…?
  • Which AV(s) did you use before Avast…?

64 bit Windows 10 no other security software installed and this system has only had Avast on it, seriously thinking of ditching what used to be a half decent program and switching to sopmething else.

Again, which build…?

If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A