On my Jaunty install with plugin version 0.2 RC, the Show/Hide tabbar plugin doesn't work. The menu item appears but checking/unchecking has no affect--the tabbar is always visible and cannot be hidden.
With the latex plugin disabled, the show/hide tabbar plugin works.
I might also mention that none of the building features worked (only tested on file names with spaces), but that everything else I tried does (including e.g. the outline side pane).