Hi All, I'm having a REAL head scratcher here at the moment. We're working with a bunch of large assemblies here at the moment on our network and I'm having a problem on my workstation whereby when I open one particular assembly it opens with a bunch of mate errors. If I rebuild a bunch more pop up, but if I then RELOAD the assembly they go away and the assembly builds fine. The thing is that when I come to shut down SolidWorks, SLDWRKS.EXE won't shut down and needs to be shut down from the task manager. The odd thing is that this assembly opens, rebuilds, behaves and saves fine on every other workstation in the office. Colleagues of mine are having trouble with other assemblies that open and build fine on my machine but not on theirs. It's almost like there's some kind of local copy or outdated version being held in memory or cache somewhere that's being dragged up when it's loaded but disappears when it's reloaded. I don't think it's a SolidWorks setting as it's occurring across multiple workstations with different assemblies. Right now this is pretty much crippling our design effort on a project as there are a bunch of assemblies which are now extremely fragile or unusable, and we're also reluctant to release designs for manufacture when assemblies might not be building correctly. I've tried everything I can think of to solve it, including creating local copies of the assemblies, moving the entire master assembly to a new folder or location and nothing seems to work. Running SW2010 SP3.0 and also all other earlier service packs and the problem is consistent across all. Anyone got ANYTHING I can try to alleviate it? Thanks, George.