The changes to the screensaver in 6.4.6 broke it completely for me. It no longer launches the client at all. Also the setting "Go to blank screen" has no effect either. It basically just shows the "BOINC is not running. Please launch BOINC to display graphics" image and does nothing else.

In 6.4.5 the screensaver still worked (but that version had its high CPU usage issues with GPUGRID). I also tried 6.6.11 with the same result (installed with the "Use BOINC screensaver" option). Otherwise either version works just fine from the BOINC Manager. Checked the firewall, no issues there (access to localhost granted to the screensaver).

Is there any instrumented version I could run, since the screensaver leaves no logs that I'm aware of when the client is not even started (checked the "Data" directory).

Windows XP Pro SP3, 8800GT with the 182.06 driver. Message digest for the digital signature on the 6.6.11.0 boinc.scr in my WINNT directory is:
04 14 fd 34 c7 80 e4 de ...4....
8b dc 2c 3b 5f 0a 8f ef ..,;_...
90 af bb d0 e6 4e .....N