Ok this was me deliberately trying to crash it by minimising.
I had a slightly different result, in that by minimising the moment the connecting window came up and maximising straight away, it didn't have a problem. However, when I minimised again a second later, it did crash.
This is something that presumably has already been noticed, but the following section seems to always be the same, after an Win32Window: appEvent LoseFocus
GFXCardProfiler (D3D9) - Unknown capability 'GL::Workaround::X1600LimitClipmapSize'.
Allocating a 512 px clipmap for a 8192px source texture.
- 4 base clipstack entries, + 1 cap.
- Using approximately 6.650000MB of texture memory.
GFXPCD3D9Device::waitForLostDevice - Device lost, waiting to reset...
GFXPCD3D9Device::waitForLostDevice - Waited for 1996ms but device still lost, aborting wait
Edit: just noticed this is what Gheist posted above.