Import Script greyed out

I've noticed that at (seemingly) random intervals the Import Script option in the right-click menu for Python tools will grey out, like so:

Attachment 19593

If the script is cached as well (which is usually the case), the only option is to create a whole new interface. This is starting to get pretty frustrating. Does anyone know why this happens - or better yet - how to fix it?


Many thanks.

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