John,
This is not a NetTalk issue but a memory driver issue.
Try this:
In the IDE select the Application's Global Properties Tab
Click the Actions button on the far right
Click on the Individual File Overrides Tab
Select the memory table in question and click the Properties Button
Select "No" in the Use RI Transaction Frame Drop Down
Click the OK button on each screen as you back out
I think that will work for you.
Regards
Parker