FATAL ERROR: unhandled access violation reading 0x0030 exception at

When opening some dwg's in ADT 07 we get this fatal error:

FATAL ERROR: unhandled access violation reading 0x0030 exception at (then it lists a location...couple different ones)

Anyone know what causes this?
Others can open the dwgs just fine, and this doesn't happen on all the dwgs they open, just a couple.
I've looked for hotfixes, object enablers, reloading a profile, running a ccleaner for temp files and registry repair, defrag.

The next step is uninstall/reinstall of the entire program....really hoping to not have to do this.

Still don't know the cause.

Currently I suspect that some registry key has been corrupted and a full uninstall/reinstall may be required.

Here's what I tried:
reloading profile
recovery/audit/purge/purge regapps
installed some hotfixes
turned validate digital sig off
already has the ABS object enabler
ran ccleaner and defrag on computer
The only thing that worked was copying everything out of the "bad" dwg and pasting it into a brand new dwg. However, I believe that this will be temporary if someone starts working on the dwg again it will probably stop working.

Anyway..that's the update from here.

I'm currently having the sam issues...
FATAL ERROR: Unhandled Access Violation Reading 0xffffffff Exception at a6574ch

If any questions please inform...

Do you know what is being done at the time that it crashes?

What version of the software do you have?

For your error dortega4269 you may want to look at these:

http://usa.autodesk.com/adsk/servlet...linkID=9240617

http://www.cadforum.cz/cadforum_en/qaID.asp?tip=768

http://www.eng-tips.com/viewthread.cfm?qid=6834&page=4