The text "Year C" is not currently available to Accordance.
Then a completely blank workspace (without any tabs) will open behind any currently open workspaces. If no workspaces are open at the time, a new workspace with a search tab set to my default English Bible will open, and behind that will be the completely empty workspace.
The workspaces in question (in happened with more than one) are all three years old, and I haven't worked with them in the meantime. At some point in the past, I renamed the User Tool then called "Year C".
I finally got these workspaces to open correctly by:
-duplicating an existing user tool
-naming it Year C
-Adding it in the Library Window
-Opening one of the problematic workspaces
When opened, the workspace included several tabs, only one of them set to the missing "Year C" User Tool. Year C was the leftmost tab. That would appear to be the problem. When I:
-moved the Year C tab to the right end of the workspace
-saved the workspace
-closed the workspace
-removed Year C from the list of User Tools in the Library Window
-reopened the workspaceI got the same warning, but the workspace opened, just wihtout that tab.