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My organization upgraded MLwiN to version 3.01 recently but I found that macros written in an older version (e.g. version 2.36) do not work in the latest version. It shows the error message: MLwiN encountered a problem and has stopped working. We use Windows 10.

Is this a bug? Thanks.

On the whole macros written in older versions are supposed to continue to work when the software is updated, except in the rare cases where commands have been altered/removed. I would suggest updating to the latest software release (available from https://www.cmm.bristol.ac.uk/clients/softwaredownload/), as there have been a number of bug fixes since version 3.01. If you are able to create a small reproducible example demonstrating the problem that would be useful.