Users will currently not be able to access their galleries either via the My Gallery link at the top of the forums, or by clicking on Gallery icons in user's profiles.
We are aware of this and will be working over the next few days to get the gallery system up and running again. This is in part related to the migration to a new faster web server which occured recently. Please bear with us while we work on this.
Update: Galleries are now back up, thanks to our server admin!