First try an older flash player, I had that problem and it was because of the latest flash update. I've also had many issues with some sites that have mixed content, java and flash, so I've done some testings loading multiple flash pages and it crashes sometimes, even if you don't interact with it.

This also may be a problem with voodoo kernel, since crash logs always mentions dyld, (On AMD systems it's built into the kernel).

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CPU: AMD Athlon 64 3000+ @2.3Ghz - Motherboard: ASUS A8N-SLI nForce4 SLI - nForceLAN by eno - SuperNForceATA by Medevil - RAM:2 GB DDR 333Mhz Audio: ALC850 Video: XFX nVidia GeForce 8400GS 256Mb (0x06e4) QE & CI from Chameleon 2 RC4Ethernet: Realtek RTL 8139 Series (working out of the box) OS: Snow Leopard 10.6.4 (aryajuanda's guide) + Windows XP 64bits