Help deciphering Crash Log - quite long, sorry.

Question

Best I can recall, this has been happening since I got the current Dual 2.5 GHz PPC G5 w/3 GB RAM back in March that I'm running(w/Black Magic Decklink Extreme card) Over that period, it's gotten better, and worse and now, after 6.0.1, much worse.
What I'm running: OSX 10.3.9, ATI Radeon 9600XT, 6 - 512 MB sticks of RAM all DDR SDRAM PC3200U-30330 from the same vendor/manufact. and Apple Hardware Tested o.k. FCStudio 6.0.1, latest DeckLink Driver, QT 7.1.3
Full freeze & lock up in FCP now every couple hrs or so.
Here's what happens: could be in canvas, or viewer, or playing a seq. in time line and everything freezes. No cursor movement, no clock ticking in menu bar, no nothing. No force quit, no spinning beach ball, no nothing, just frozen screen on both monitors,(well, frozen everything actually) and picture dissapears from video display, (component out from Deck Link). Only option is hard re start.
Never happens doing the same thing, happens in any/every project.
Here's what I've done: ran Hardware test, combo updater, reinstalled FCP, deleted caches, repaired permissions, Disc Warrior, isolated and tested each of my media drives, tried removing 2 RAM sticks at a time till I'd tested/isolated all 6, and all to no avail.
I've looked at all sorts of 'How-to's' regarding how to figure out crashes from crash logs, but nothing that I've been able to see is any help. Here's a copy & paste of most recent info from Library/CrashLog/FinalCut Pro:
Command: Final Cut Pro
Path: /Applications/Final Cut Pro.app/Contents/MacOS/Final Cut Pro
Parent: WindowServer [62]
Version: 6.0.1 (6.0.1)
Build Version: 3
Project Name: FCPApp
Source Version: 706230001
PID: 261
Thread: 0
Exception: EXCBADACCESS (0x0001)
Codes: KERNPROTECTIONFAILURE (0x0002) at 0x00000000
Thread 0 Crashed:
0 <<00000000>> 0x00000000 0 + 0
1 ...uartzComposer.FxPlugWrapper 0x0b80e544 dyldstub_Z15ContextProviderv + 192948004
2 com.apple.FinalCutPro 0x005053ec QCEffectRuntimeDataDestructor(void*) + 76
3 KGCore 0x00b10f9c KGMemoryPtrRelease + 128
4 com.apple.FinalCutPro 0x0013d268 RefPtr(void*, unsigned char) + 44
5 com.apple.FinalCutPro 0x00143698 KGTypeReleaseValue + 100
6 com.apple.FinalCutPro 0x0002dcdc FreeAll(HashDict*) + 176
7 com.apple.FinalCutPro 0x00030470 FreeHashDict(void*) + 24
8 KGCore 0x00b10f9c KGMemoryPtrRelease + 128
Thread 0 crashed with PPC Thread State 64:
srr0: 0x0000000000000000 srr1: 0x100000004200f030 vrsave: 0x0000000000000000
cr: 0x44022204 xer: 0x0000000000000000 lr: 0x000000000f75f444 ctr: 0x0000000000000000
r0: 0x000000000f75f444 r1: 0x00000000bfffb800 r2: 0x0000000033b7b200 r3: 0x000000004103efc8
r4: 0x0000000000000001 r5: 0x000000002ddb466c r6: 0x00000000ffffffff r7: 0x000000000b99d000
r8: 0x000000005e4e3e2c r9: 0x0000000000007000 r10: 0x00000000000006bb r11: 0x00000000a2f13024
r12: 0x0000000000000000 r13: 0x0000000000000005 r14: 0x0000000000000000 r15: 0x00000000a3297698
r16: 0x0000000010a70ae0 r17: 0x00000000bfffeec0 r18: 0x0000000077696e64 r19: 0x0000000000000000
r20: 0x0000000000000000 r21: 0x0000000000000000 r22: 0x0000000000000003 r23: 0x0000000000000007
r24: 0x000000000b81e350 r25: 0x000000000f4e1f30 r26: 0x000000002ddb44e0 r27: 0x000000000b81e350
r28: 0x000000000b81e350 r29: 0x000000000b81e350 r30: 0x000000002ddb4650 r31: 0x000000000f75f410
G5 MacTel 3Ghz Quad   Mac OS X (10.4.9)  
G5 MacTel 3Ghz Quad   Mac OS X (10.4.9)  

Answer 1

your crash log suggests that an FxPlug caused a memory access error
this might mean you are using a buggy FxPlug ...
if you have any third party FxPlug's that you are using that you think may be the cause then try disabling them
... or given the timeframe for the start of th problem, maybe its more likely you have a dodgy graphics card or dodgy Decklink card? try pulling out the Decklink card and see if you still get the problem . if its still there, try swapping out the graphics card with another if you have a second card/machine available