[Therion] metapost error on Windows7

I have never seen this locking during compile, apart from PDF files. I am using Therion extensively on Windows. One case we found on Windows which had us stumped on a training course we ran was that one Windows user found his PDF file was locked even after apparently closing the Adobe reader. It

[Therion] Survey length anomalies

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[Therion] Offsets with shadow or outline also shown

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