Let me start by acknowledging that this is may not even be worth fixing.
Yesterday I was keeping track of the new page processing/load speed data. I was copying and pasting using Ctrl+C and Crtl+V. That worked fine for all the puzzles except for the 12x12, where 'copying' resulted in a 12 in the highlighted cell of the puzzle. I know that you use Shift and Ctrl to pencil in positive and negative numbers respectively (a great feature, btw). And I know that you have mapped A-F to 10-15 (another great feature, btw).
I also know that this is a minor issue with easy workarounds. You can still cut selected text on the 12x12 using a right click or EDIT >> CUT from the menu. I suppose if you wanted to scan for something on a 15x15 you would need to use EDIT >> FIND.
But if you are ever messing with keyboard mappings and think to do it, you might leave C and Shift+C as 12s, but return Ctrl+C to 'cut'. That is, unless you are planning to make 25x25 puzzle with a range from -12 to 12, in which case we'll need Ctrl+C for calcudoku purposes after all.
![[woot]](./images/smilies/msp_w00t.gif "Woot")