Selecting NAMEBOX causes Excel to crash

[TripleXFB]

This has probably been dealt with before but I am now tearing my hair out with this problem.

I have many spreadsheets created using names for cell ranges for use in formula, nothing new there.

My problem is that if I try to use the NAMEBOX to jump to the named ranges excel crashes with message box Excel needs to close etc.

Even happens with a new sheet without any names set up.

Using XP SP2, Excel 2003 Add ins as per attachment.

Any help with this would be much appreciated