Some experiments this morning: adding the full Calibre folder to the SME exclusions, rather than just the "calibre.exe" file, does appear to significantly shorten the lock-up. It still happened this morning, but only for perhaps 20s, which is much better than it was before.
I'll try various things over the next few days and see what works best.
Yes, you're right, Kovid - the lock-up is occurring before the Calibre splashscreen appears, which makes me suspect that it's caused by the framework initialising. I don't think it's related to my library.
Thanks for your help, everyone - it's much appreciated.
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