Adobe Acrobat Cloud
I experienced issues accessing Adobe Acrobat Document Cloud https://cloud.acrobat.com/documentcloud with the Vivaldi 1.4.589.2 Snapshot. I confirmed that it was not a site issue by using Chrome 52.0.2743.116 m to access the site and this it did without a problem. So I uninstalled Vivaldi 1.4.589.2 and installed the Stable version 1.3.551.38 and I could access Adobe Acrobat DC without any problem. So there seems to be an issue with Vivaldi 1.4.589.2 Snapshot.
This morning I installed version 1.4.589.11 (Stable channel) (32-bit); installation was successful,
HOWEVER, the issue reported above is not resolved with the new stable version.
I am still unable to access ADOBE PDF services.
I will uninstall 1.4.589.11 and reinstall the previous stable version 1.3.551.38