We have updated Flowzit to support the newly released Flash 10 plugin so this is no longer an issue.

Currently, attaching files in Flowzit does not work with the new Flash 10 plugin.  All other features work fine.

The problem is Adobe's decision to remove support for web applications to display the "File Open" dialog programmatically.  This doesn't just affect Flowzit, but also other HUGE companies like Yahoo and Flickr.  Surprisingly, Adobe didn't cave in on the decision, even with the likes of Yahoo pressuring them to reverse course.

In the end, there is a work around and we are working on it.  In the mean time, sit tight with Flash 9 and you'll be fine.