Strange memory read error with BHO

[krishnamoo...@hotmail.com]

I have a BHO which launches my Explorer Bar. It has been working fine
for some time now. But now I am seeing some strange behavior which I
am
unable to debug or explain.

With my BHO enabled and my Explorer Bar in expanded state, when I
close
the browser it throws some memory read error.

If I go to manage addons and disable AcroIEHlprObj BHO and Yahoo IE
Services BHO on different combinations, the error doesn't show up.
Even
with those two BHOs enabled, if I browse to some web site in the main
browser or click anywhere in the browser (like minimize and maximize)
and then close it, then also no error is thrown! If my Explorer Bar is
in minimized state then also closing the browser doesn't throw the
error.

When I debug, the debugger is not anywhere in my code when this error
happens so I have no clue as to what is going on.

Has anyone else seen this issue? Any ideas what could cause this?