Yesterday I ran an update on my Acer Aspire One, which I operate under Fedora11.
Umongst the updates was also an update for Qjackctl and the jack audio connection kit.
After the update I could not start Qjackctl anymore and all my possibilities with rosegarden and my USB keyboard and fluidsynth were gone. I restored to the system before update ran the update again excluding the two packages concerning jack. Perfect, it works again.
So it seems that there is a bug inbedded in the update. Anybody having the same experience?
By the way, I am quite happy with Qjackctl as the connection tool between my various music making options, which are not very fancy, but I enjoy them. Despite comments in other parts of this forum Qjackctl works very well on the Atom based AAO.
I have a kind of protocol of the failure of qjackctl and what I did. I can make that available if necessary