I've just installed BOINC/SETI@home on my new MacBook Pro (2.5 GHz, Intel Core i7) running the latest OS (10.7.3). When BOINC starts as the screen saver the display "pulses" every couple of seconds between the BOINC opening window and my desktop. The screen savers supplied with the OS run normally. Are any other MAC OS "Lion" users having this problem? Running BOINC on my older MacBook Pro, using system 10.6.5 had no issues.