ptb error

1
Hi,

I am new in psychtoolbox and when I try to run Screen.m on a MAC OS X
with ATI Radeon HD 2600 Pro and i get the following error:


%%%%%%%
WARNING: Couldn't compute a reliable estimate of monitor refresh
interval! Trouble with VBL syncing?!?


----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! ----
%%%%%%%%%
Previous posts suggest solutions for Windows machines. Any suggestion
for mac users?

Moreover., my experiments are on decision making and therefore
millisecond precision is not needed. Could i continue by forcing it to
skip the test (Screen('Preference','SkipSyncTests', 1);

Thanks

George