Illustrator SDK sample: Windows plug-in error when exporting to EMF

Hi All,
I'm trying to create a plug-in that exports a whole AI document or just a selected portion of it to an EMF file.
I've used classes from [SnippetRunner] SDK sample, i.e. from \Code Snippets folder, and I've encountered a very strange behavior when calling
SnpDocumentActionHelper::ExportDocument(ActionDialogStatus dialogStatus, AIActionParamValueRef parameters)
with formats such as WMF, EMF etc.
If function sAIActionManager->PlayActionEvent() is called with 'kDialogOff' status an error message "The plugin cannot complete because of an unknown error" appears, although the export is completed and the return code is 'kNoErr'.
If I try exporting with a dialog interface (omit parameters or 'kDialogOn') everything is fine.
I checked it both for CS3 and CS4 SDK, as well as for WinXp and WinVista.
I also tested with the actual sample plug-in (SnippetRunner), same behavior.
Is this an SDK bug? Any ideas?

I don't have a lot of experience with this kind of problem, but the first thing I'd check is the parameter block you're passing the action call. I don't know why it would matter if the dialog appeared or not, unless the export settings block wasn't being filled in with everything it needs?
You might try recording an export you perform manually via the action palette, and then saving it to a file. You can open it up manually and compare it (even if it's a binary block) to what you're doing in code. You might spot something that way.
I don't know what else to suggest though. It's unlikely to be an SDK bug, though it could be a bug in the action-aware part of the exporter.

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