Multi sheet drawing

Many things have been said about drawing sheets but we have had an issue for a few years, that no one here has been able to solve.

In all our title blocks, we have a string of plain text (not a custom property) with the word COPYRIGHT, and the current year next to it.

We update the year to the current one when we come back from our summer break in January.

We open the DRWDOT file of every drawing sheet templates and manually edit the year, save and close.

When starting a new drawing and selecting any of the Drawing sheets, the updated year appears in the title block: so far, so good!

The issue comes up when adding a second sheet: it displays 2012 next to the word copyright...

I have checked all the DRWDOT files on the network drive and they all now display 2014 in the title block.

Even reloading the sheet doesn't work.

I can't find where the drawing sheet with the year 2012 comes from...

What am I missing? Any assistance greatly appreciated.

Thanks in advance.

SolidworksDrawings And Detailing