If you edit an issue (eg. edit the description) which has a time estimate on it, the time estimate gets set to zero (this shows up in the changelog once you've edited the issue).
Clicking the 'Force users to log time" checkbox from the Administration -> Projects -> [project] -> Overview tab has no effect.
When you click the Update button the checkbox goes back to being unchecked.
In addition, it is not clear at what point the users will be forced to log their time (when editing a ticket? Or when closing a ticket?). Some clarification text may be needed.
Clicking the 'Hide time logs from clients and anonymous users." checkbox from the Administration -> Projects -> [project] -> Overview tab has no effect.
When you click the Update button the checkbox goes back to being unchecked and clients can still see the time logged.
It's great that users can log their time spent on issues, but this is effectively useless if we cannot then view reports of the amount of time spent on issues.
Ideally you would be able to see a report of time spent on a per-project basis, and also on a per-user basis both across projects and within projects.
For more awesomeness, you'd also be able to filter these reports by other relevant fields, such as version and area if necessary, and also be able to specify date ranges.