Thanks jcl. It of course could possibly be a problem with my PC or its configuration. But I don't have another PC readily available...

Re. diag.txt, I can't find one containing the issue - perhaps buffers weren't flushed when Zorro crashed? Also, I'm seeing multiple diag.txt's - with and without asset names in the filename. What is the difference between them and which diag.txt(s) should I be looking for?

None of them appear to be time-stamped. Would it be possible to create separate time-stamped files rather than appending so it would be obvious which file related to which strategy run?

Thanks.