Today new versions of both the client and the server were released: Client 0.8.4 and Server 0.8.2.
The client has a greatly improved issue history view which combines comments, attachments and changes into a single view and supports finding text and context menus. The comment editor has also been improved and now it's a separate window, not a dialog box. Finally, uploading and downloading attachments is more comfortable now, a progress bar is displayed during the transfer and remote files are handled correctly.
The server can now store attachments as files, not only in the database. This capability greatly improves performance for large attachments and helps using the server when database space is limited. A script which updates the database allows to smoothly upgrade from version 0.8.1.