@Hadden89 Hello mate, thanks for your reply.
No, I simply restored the older version (6.1.3530.110) that was also running and working perfectly on my second NvShield.
I haven't the time or patience to spend a day messing about 'testing' to find which exact version became unusable.
I expect to simply update the app and it works as it did before.
This old v6.1 also has the Home button there which I find convenient for my use.
Yes absolutely -I ONLY get the APKs directly from Vivaldi, and for the older v6.1 I found Vivaldi even have archive of previous versions, thus avoiding the dangers of getting APK from some other place.
I did also file a bug report, which I hope helps to get it all working perfectly and up to date again.
I must say I am quite impress that my FB Chat message to Vivaldi were actually replied to, and they asked me do bug report.
As I told them, for some unknown reason Vivaldi browser isn't available on the Play Store, but I can confirm (until at least v6.1) it worked perfectly, of course one needs to use the Nvidia Controller Pad and remap Button X to open the app (as it doesn't appear in list of apps), apart from that it is the best.