Edit no longer works

Running 4.0.1206.0

I frequently make use of 'Edit' rather than 'Open' so that the local copy (I think kept in appdata/local/temp) is monitored and uploads on saved changes.

I seem to have lost the ability to do this. It doesn't matter if I select Open or Edit, the file moves to the Transfer Queue, downloads and then vanishes from the queue instead of staying there with "monitoring' or something similar under status.

Help!

When you click on Edit the file is first downloaded and then an entry is added in the Schedule pane. So you can find the monitoring item in the Scheduler pane.