Lunav

V2 crashed after updating to 2.7.1 and wont start again ... it opens as a plain white screen and does not respond ... had for force quit the viewer . After finding help here downloaded older version 2.6.9 .... after a while this version crashed too and did not respond again same like 2.7.1 .... so downloaded 2.6.8 and that crashed too and wont start again .... what should i do to fix this bug .... i am using mac book version 10.6.6 2.1 GHz intel core 2 duo ...