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I can confirm this behaviour: the up and down arrows don't work. You can however click in the number field and either type a new number or use the arrow keys to advance the number up or down. In fact this is how I usually do these things so originally I couldn't find anything wrong!
Seems like a bug to me.
Thanks Andrew, I didn't think to use arrows/numbers – my immediate thought was that a preference/setting changed via the upgrade and set off trying to find that.
We are aware of this issue and are working towards fixing the same.
In the meantime, please try using the workaround suggested by Andrew.
Another bug I've found in this release is if you select some text and try to type in a value in the Baseline Shift, it overtypes the selected text instead of changed the Baseline Shift value. Crazy stuff.
We have released InDesign CC 2015.4.1 today.
The above issue has been resolved in this update.
The update will show up in the Adobe Creative Cloud desktop application.