I just lost 2 hours of work because a derived sketch crashed sloidworks and the autorecover didnt work. So not impressed, the converte entities had been discussed before.
Its really sweet because im working in an office with huge windows, it's sunny outside and did I mention its EASTER? fak!
I have noticed a difference in 2010 vs 2009 with respect to the "convert entity" problem you mentioned. It does not seem to be as responsive as pre-2010.