It's difficult to know exactly without looking at the worksheet, but as a
first guess I would suggest that you check to see if there's any conditional
formatting applied to the cell(s) that are giving you trouble - You may be
entering some data that triggers a formatting rule to turn the cell blue.

HTH

Neil
www.nwarwick.co.uk

"blue" wrote:

What have I done which has resulted in a blue square instead of data??