Unexpected Quits in multiple applications at Save or Import/Export window

Question

Hello,
For several months I have Apple and Adobe applications as well as Firefox, randomly quit when bringing up the Save, or Import/Export window. (I have copies of the error logs.)
I thought I had it fixed since I haven't had any issues for some time after running Disk Utility and Onyx. But, I posted the same issue a couple of months ago and the solution (at the time) was to keep the desktop clean (see "Crashing at Save" by katorama) . So, after I cleaned up my desktop and only had two aliases to my folders I needed, all went very well until now.
However, what didn't help is that yesterday we had three power outages and my iMac did an auto-restart after each. Since then, the problem returned and nothing seems to fix it.
I feel like this issue is haunting me! I was a tech for many years and normally can fix the issue. But, I can't seem to figure out the reason behind these crazy unexpected quits. Seems I've run out of tools in my toolbag.
TROUBLESHOOTING ATTEMPTS:
– I have run Disk Utility to verify and repair disk and Onyx to clean out caches. After this, it seems to run fine, then a different application will have the same problem.
– When I create a new user account, there is no response when I double click the hard drive (it does not open) and when testing an application for the quit issue, it happens again.
– Also, when I restart into Safe Boot the problem appears to stop initially, but can appear intermittently again.
I suspect it may be a RAM or even a Quartz issue? But, honestly, I have no idea. 
< h   e   l   p   ! >
Any suggestions welcome!
thanks!
–kat
10.6.8
3.06 GHz Intel Core 2 Duo
4GB 800 MHz DDR2 SDRAM
Format: Mac OS Extended (Journaled)
Capacity: 749.81 GB
Available: 592.7 GB
Used: 157.11 GB on disk (157,110,349,824 bytes)
Here is a bit of the log:
================================
Process:         Safari [508]
Path:            /Applications/Safari.app/Contents/MacOS/Safari
Identifier:      com.apple.Safari
Version:         5.1.1 (6534.51.22)
Build Info:      WebBrowser-75345122~2
Code Type:       X86-64 (Native)
Parent Process:  launchd [91]
Date/Time:       2011-10-27 15:48:07.784 -0600
OS Version:      Mac OS X 10.6.8 (10K549)
Report Version:  6
Interval Since Last Report:          -470736 sec
Crashes Since Last Report:           42
Per-App Interval Since Last Report:  1761 sec
Per-App Crashes Since Last Report:   1
Anonymous UUID:                      0D81673F-96B5-47DD-B1D9-54E5137F2176
Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread:  0  Dispatch queue: com.apple.main-thread
Application Specific Information:
*** error for object 0x10aabe408: incorrect checksum for freed object - object was probably modified after being freed.
================================

Answer 1

Hi.
This is about a question you posted to the Firefox Support forum three months ago (I'm sorry you never got an answer).
Did you ever fix the problem where Firefox freezes or hangs, when clicking a download link or using (File menu) "save as" or "open file"? Or when going to the Firefox (Tools) menu and clicking Options ? Or trying to Import or Export bookmarks?
I found this thread searching for a solution for someone on MozillaZine's support forum who's having a similar issue. See this thread: (maybe something he's tried that didn't work for him will work for you?)
http://forums.mozillazine.org/viewtopic.php?f=38&t=2382953&start=15
<br>Cannot download or click tools -> options