Jan,
I had only one instance checked in you settings. However, I do have the 3rd part
installers from SourceForge and had run edit-multi-sessions.js he provides. This
seems to have a way to bypass your single instance setting but the dll as you
say cannot deal with a hidden instance. If I run his edit-single-session.js, all
works in PSPad as designed.
The 2 scripts he provides seems to break PSPad's design logic. To be honest it
may be better for PSPad if you developed your on context dll so you could
control all its operation.
Regards,
Pete

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