Left laptop in sleep mode over the New Year's weekend. This morning upon starting PSD, found that the Connections pane was open, which I don't use and had removed from the sidebar, and my custom toolbar configuration was gone, replaced by the default.
Odd that, unless PSD updated itself with the crossing into 2016.
Only posting this in case others are seeing the same thing on the first work day of the new year.
build 11.0.4.1774