CSV Import and Text Truncation Problem

When I create a csv file from an Excel spreadsheet and import the file into Omeka, everything imports fine except for one column. It gets truncated to only 4 characters. If I do a delete on that column and re-type it, then the resulting csv imports great, including the column that was previously truncation.

Any suggestions as to who I can correct the column formatting or whatever so the csv file will import correctly without having to retype everything?

Is there anything special about that column, or the data in it? Maybe a special character or something that isn't being encoded properly?

If there's a manual line-break inside the Excel cell, that can sometimes cause problems. I usually copy my data to Notepad++ so I can view all characters and check for oddities like that.