I thought it may be a thread issue, but I am running an Octocore CPU, and have only 2 threads assigned to the print - but anything that runs in 64bit mode and uses multiple threads seems to adversely affect the print.
yeah I pretty much just install 32 bit os on the machines I build. It's faster, everything that worked on xp works, right click menu items work and it's a lot more stable.
Why the commercial bods use the 64bit os is beyond me. Given that 99.9% of software is still 32 bit and has to be run under a 32bit emulator.
Hell there's even a 32 bit version of windows 8, and if microsoft haven't scrapped it by now, then there's a good commercial reason for it.

The helmet is amazing serena !

But you do realise it's useless without the REST of the stormtrooper costume ? :-)