I was getting frequent crashes and computer reboots and out of memory messages.so i installed the FS9.1 patch last week and it seems to have fixed the problem.I have been dubious about intalling it as I have read so many posts about people having problems after installing it. It installed with no problems on my system and i have got loads of addons installed and have not had any crashes since installed it.Wish id done it ages ago now.Doesnt show any visual improvement but seems to make FS more stable.Just thought i'd let you know my experiences as all the negative remarks puts you off.

Yea me too. Never had any problems with the update :) TBH I did not know it was causing so much debate until a long time after I discovered the world of FS9 forums..!