Hi toggie, if you only see the problem with large files, probably MoI is running out of memory during the file loading - that's probably the only other explanation for that kind of partial load behavior than a failing disk.

MoI is currently a 32-bit program and so it has some limits on the amount of memory it is able to use.

One thing you can try is to alter a view setting to make a coarser display mesh which will consume less memory.

To do that, go to Options > View > "Meshing parameters" and set the "Mesh angle" option to 25 degrees and uncheck "Add detail to inflections". That will make a somewhat rougher looking shaded display but will also consume a lot less memory on complex models and that may help avoid running out of memory in the middle of the import.

I am in the process of a major rewrite of MoI for version 4 to make it 64-bit. It will still be a while before that is finished but when it is that will enable MoI to use all your system memory and that should help with larger imports then.

I'm still not sure why you see different behavior with different user accounts though, that's pretty mysterious.

- Michael