How are you going on physical machine resources, have you got plenty of
headroom left? If you have, then the usual clean out of temp folders, empty
all the applets running in SysTray, open the assembly first, then try to
open the IDW. Have all the parts been rebuilt to check their sanity? Oh
yes, and don't forget graphics drivers!!!!
Seriously, I've had this with large datasets and I ended up doing all the
above and eventually I got it to open. Another time, I had a problem with a
bad fillet on a custom fastener (radius was too large for the faces it was
attached to). Inventor 7 was happy with it but 8 just refused to open the
drawing. I found the offending item after opening the assembly and doing
some naughty things to it to force it to break. IDW opened fine after that.
John Bilton