I don't have an idea yet whether this is a Sibelius issue, or VE Pro, or whatever. I'm using all most recent updates, except OS X is still at 10.6.6.
I've been using a rather small setup, either Brass Quintet, WW Quintet, or a combination of 5 brass and 5 ww. In VE Pro i load the Presets that were made for Sibelius by VSL. I have recently upgraded all of the DL instruments, which is all I'm using, with their Extended versions (Sibelius Presets).
I use the Vienna Instruments House Style. In Sibelius Playback Devices, I'm using VE Pro with the Woodwinds + Brass Soundset.
Is anything I'm doing contributing to the constant crashing of Sibelius?
Also, I've noticed that when I can quit Sibelius normally, the Window containg the VI Pro instrument in VE Pro, will close normally, but I always have to use Force Quit to completely quit VE Pro.