Here, the writer/calc launcher work (didn't try the others, bu they should work too). Only the start center doesn't work. But, if I recall correctly, this launcher doesn't appear in the gnome menu by default. So, it should just be disabled. Otherwise, it won't work, since the start center can't be launched twice, at least the "open a new window" menu will *never* work.
Here, the writer/calc launcher work (didn't try the others, bu they should work too). Only the start center doesn't work. But, if I recall correctly, this launcher doesn't appear in the gnome menu by default. So, it should just be disabled. Otherwise, it won't work, since the start center can't be launched twice, at least the "open a new window" menu will *never* work.