Press "Ctrl + F3" to bring up the range name manager and look at the one called "customisable".
The "Scope" of this named range is restricted to one sheet only, rather than Workbook.
Simple enough to fix:
1) Unlock the workbook (take the password off)
2) Press Ctrl + F3
3) Delete the offending named range
4) Recreate it, ensuring the "Scope" is set to "Workbook"
5) Try the userform again and see if it works.
Happy Friday.
BSB 
PS. A little research into "Dynamic Named Ranges" might be a good idea. It will be half an hour well spent and you'll not look back.
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