An updated ROM is now available for HTC Touch Diamond users to download. HTC advise Diamond users to reapply this update on the models with the language version listed below if you installed this update prior to February 27:
Release Date: 2009-02-27 Category: ROM Upgrade
[The update is available for the following languages: English (Pan Europe and UK), Italian, French, Dutch, German, Swedish, Spanish, Portuguese, Danish, Norwegian, Finnish, Middle East English, S. Africa English, Russian, and Arabic (Egypt and Middle East)] Full details and link to the ROM after the break.
Improved Functions and Fixes
1. When you launch the Camera while the system is working on other programs, the preview screen may become black.
2. When playing a video, sometimes a portion of the video will be cut off a little bit.
3. Fixes Audio playback problem with the speaker. Specific issues: sometimes the music will turn off and on after 10 minutes, or there is a buzzing sound or no sound at all.
4. Fixes the problem of not being able to receive MMS when in standby mode.
5. When launching music via the Music tab on TouchFLO 3D, the sound may intermittently turn off for a second and come back on.
You can get it from HTC here