I use xubuntu 13.04 with compiz window decorations and can confirm the problem.
As #5 already explained, programmes that are opened into a maximised state suffer from broken window decorations, meaning that the minimise/maximise/close buttons do not work, and that by trying to click these, one actually clicks-through to whatever is behind.
Unmaximising windows (by right-clicking on the programme in the panel) does indeed re-enable the previously broken windows decorations, meaning I can use the buttons.
I use xubuntu 13.04 with compiz window decorations and can confirm the problem.
As #5 already explained, programmes that are opened into a maximised state suffer from broken window decorations, meaning that the minimise/ maximise/ close buttons do not work, and that by trying to click these, one actually clicks-through to whatever is behind.
Unmaximising windows (by right-clicking on the programme in the panel) does indeed re-enable the previously broken windows decorations, meaning I can use the buttons.