Carmen, thanks, that's really helpful. If we need further information we'll reach out - as is so often the case, I'm doing some technical investigation for a development that may not ever be tackled, or may be tackled in a different way, or whose specifications will change wildly before we tackle it, or...!!!

Alex, thanks. Yes, license is still valid. And no, not possible to suspend before changing problem item - getting databases locking errors when I try. No idea how we managed to corrupt this quite so thoroughly!!

Thanks Alexander. Terminal Task Manager:

• can delete other tasks, but
• trying to delete the "corrupted" one get: "ERROR #5803: Failed to acquire exclusive lock on instance of '%SYS.Task'" (same as when using Management Portal)

Re figuring our where system tasks are stored via journalling, I understand the principle of what you are saying but we are probably reckoning the effort in doing that at least as great as scrubbing and reinstalling - we lose some config (we've got it documented, but the developer who did it originally has left), but no important running code.

Thanks. Not sure how to do all the things you suggested (1 or 3), but tried (2) using the Scheduled Tasks page in management portal. Couldn't suspend or delete the problematic task - getting SQL errors about not being able to lock or access a table.

Thanks. Not sure how to do all the things you suggested (1 or 3), but tried (2) using the Scheduled Tasks page in management portal. Couldn't suspend or delete the problematic task - getting SQL errors about not being able to lock or access a table.

Thanks for suggestion, but we already know it affects all namespaces 😥

That looks ideal, thanks! Almost like it was designed to do the job we are looking for...! 🤣 Will investigate properly for our specific situation.

Thanks @Evgeny.Shvarov. Unfortunately can't use Iris yet - maybe at some point in the future - but a useful extra benefit when we do make the transition. 

Thanks Cristiano. I'd found the page you linked to before, but its not very explicit about uninstallation!

Would I be correct in interpreting it as:

• only uninstall option is the unattended section at https://docs.intersystems.com/ens201817/csp/docbook/DocBook.UI.Page.cls…
• would I be correct to interpret 'CacheC' in the example command as the instance name of the Ensemble installation to be uninstalled? Or is that the folder name on the filesystem where it is in installed?
• Not familiar with Windows Registry editing, so can I safely delete those two trees in the registry if i want a completely fresh start?

Thanks!

Shamus, thanks, works perfectly. Much appreciated.