*Update*

As a temporary workaround, if you are experiencing problems in viewing or managing OneDrive or Group Files, click on – Switch to classic OneDrive and/or Return to classic SharePoint view found in bottom left corner.
If Switch to OneDrive Classic and/or Return to classic SharePoint view is not available as an option when viewing Group Files, re-select the OneDrive app and then enter your Group space.

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Previous Description (2017-02-17 10:28:59):

ITS is currently investigating problems being reported in the web user interface. This is affecting access to menus, groups, and possibly other functionality. At this point please try using a different browser.

This notice will be updated as more information becomes available.