Not sure, but I think you guys might be talking about slightly different things.
If you have different documents open in tabs of the same window, then you should see “FileName • Focused Project” as @fssbob describes.
The behavior that’s missing is when you have a single document open, with multiple tabs (different views into that document). In that case it used to be that each tab displayed only the focused project name. Now it just shows the file name.
The underlying difficulty is that it’s not possible (that I know of anyway) to display a different name in a tab from the name that’s displayed in the window titlebar, when that tab is selected.
I could add an option to allow you to always show the focused project along with the filename in all windows if that would be of value. It’s a bit of redundant information, and why I hacked around the problem. But I guess now that that hack isn’t working you are seeing the redundant information (the same filename listed in all tabs) anyway.
Let me know if you think that change would help.
For WriteRoom 4 (and future TaskPaper 4) I’ve written my own tab view implementation so I can display whatever I please without any hacks!