Three tasks, three blue screens. Not having a very good week.
Read compression format, at 20:53:27: Access violation at address 77866900 in module 'ntdll.dll'. Read of address 0000000C.
Interestingly; ntdll.dll again, every time. Could this be Microsoft's fault?
Also, my internet is 4G and subject to the odd wierd spike (but normally stable enough to work). Possible race condition involving a network thread?