Maybe you have some objects that get rearranged when you hide the columns using
your grouping symbols.

This may have some suggestions that work for you. It's kind of a similar
problem.

XL: "Cannot Shift Objects Off Sheet" Error Hiding Columns
http://support.microsoft.com/default...b;en-ca;211769

Remember to look for comments and merged cells.

Matt wrote:

I created a command grouping several columns together by going to Data, Group.
When I go to click on the "-" sign to group. It gives me an error
message;"Cannot shift object off sheet". Why? and how can I fix it.

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Dave Peterson