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hi,
i can confirm the problem described above.
Though it used to work really fine on 10.5 some weeks ago I dont know if its up to the latest RB release or updating to 10.5.1.
i have some custom behaviours, but now only one can be compiled&installed at one time, and as i do so the previously compiled&installed behaviour disapear in the behaviour-list in the RB settings menu and the new behaviour has a wrong icon.
on restarting RB ALL custom behaviours are gone.
i tried it with exporting & manually installing the beahviours, but it has the same effect.
My System: MacMini G4 1.4, OS 10.5.1, latest Release of RB 1.8
Thanks in advance for any help!