APPCRASH in Acrobat.dll after adding annots with AFExecuteThisScript()

Question

I have a C# app that displays PDFs in a WebBrowser control.   I also have a plug-in that loads annotations into the PDF (i.e. doc.addAnnot(<propertys>)) via calls to AFExecuteThisScript().  It works; the annots are loaded successfully.  However, whenever I do this, I get an APPCRASH after the app has terminated. Since it happens after the app exits, it's out of the debugger's scope.
Since this problem happens only after my plug-in adds annots to the PDF, I'm thinking that something Javascript-related is not being released before the app exits.  I've tried doc.dirty = false after adding each annot, and also docClose() in my plug-in's AVDocWillClose callback, but it doesn't do any good.
This is NOT caused by AFExecuteThisScript() per se.  In other words, I can do AFExecuteThisScript with or without a return value and there's no APPCRASH.  It only seems to happen when I modify the PDF (i.e. add annots) via AFExecuteThisScript().
This is not a showstopper for me but merely an irritant, because it always happens when the application terminates.  Incidentally, it did not seem to happen in Acrobat 8.
Here is the problem signature that is produced in VS 2005 after the app terminates.
Problem signature:
  Problem Event Name:    APPCRASH
  Application Name:    DrsDisposition.vshost.exe
  Application Version:    8.0.50727.42
  Application Timestamp:    4333d898
  Fault Module Name:    Acrobat.dll
  Fault Module Version:    9.3.0.148
  Fault Module Timestamp:    4b3074b9
  Exception Code:    c0000005
  Exception Offset:    0013286c
  OS Version:    6.1.7600.2.0.0.256.48
  Locale ID:    1033
  Additional Information 1:    0a9e
  Additional Information 2:    0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:    0a9e
  Additional Information 4:    0a9e372d3b4ad19135b953a78882e789
Can anyone help?
Thanks.

Answer 1

I modified my plug-in to enable it when I open a PDF from the file system with Acrobat.exe, and then create a single annot with AFExecuteThisScript().
Everything works fine, the annot is created, and there is no APPCRASH when I quit Acrobat.
I just needed to modify my AVDocDidOpen and AVIdle callbacks to make this work (to allow me to work with PDFs opened in Acrobat.exe from the file system), so everything else about the plug-in (initialization through cleanup) is the same.
One of the last lines of output was:
     'Acrobat.exe': Unloaded 'C:\Program Files\Adobe\Acrobat 9.0\Acrobat\Acrobat.dll'
It seems to me that the problem is related to the WebBrowser control, which apparently does not release Acrobat.dll when it destructs.  I've tried manually releasing Acrobat.dll in my app code after Application.Run(theForm); returns, i.e.
     IntPtr handle = GetModuleHandle("Acrobat.dll");
     if (!handle.ToString().Equals("0"))
          FreeLibrary(handle);
but that causes the app to crash on FreeLibrary().
I wonder if it would make any difference if I were to manually load Acrobat.dll in my code, rather than waiting for the WebBrowser control to do it when it opens the PDF.  I noticed that one of the first output lines from Acrobat.exe (after the windows libraries are loaded) is
ADOBE_READLOGGER_CMD:COMMENT:BeforeOROADOBE_READLOGGER_CMD:COMMENT:AfterORO'Acrobat.exe': Loaded 'C:\Program Files\Adobe\Acrobat 9.0\Acrobat\Acrobat.dll', No symbols loaded.
Incidentally, I'm unable to debug my plugin when I run my app in VS 2005.  There's no process that I can attach my plug-in debugger to, probably because Acrobat 9 uses in-process DLLs to render PDFs in browsers.