Insert Image - 2 interfaces - what logic determines which is used?

[dvsDave]

I'm running vb 4.0.6

So, when I'm in a thread and click quick reply. I make the text window active by clicking on it, and then I click the Insert Image icon.

It will bring up the old interface:



But when I am in the advanced editor, SOMETIMES it brings up the new interface:



What logic determines which interface is used and how can I force the new interface to be the default?