Data Sort & Merged cells

Hi everyone,
I'm having trouble sorting some data. I select the data i want sorted, then choose how to sort the data, but when i click "ok" it says, "this operation requires the merged cells to be identically sized."

Unfortuantely i did not create this spreadsheet. I am unable to locate ANY merged cells. The only difference i was able to find was that some rows were different heights. I have formatted all rows to be the same height and still no luck. Any ideas on how to locate the merged cells? Suggestions?

Thanks
HQH2O

If the gridlines are showing and there are no colors, you will be able to tell by following the gridlines which are merged.

When I come across that, I just always Select All and Un-merge the cells.
You have to be a wee bit careful with that because it may put things in weird spots. Save a copy of the file so you can always go back to the original if it was messed-up, but try it.