Please show the code you are using to read the data back in. I suspect the issue is going to be with either a missing or incorrect infile option or possible an extra option that is not needed.
You may need to provide a tad more detail than "goofy" and some example data from your Set Data; statement may help as well.
Also which operating system are you running?
With windows your file statment generates this error:
ERROR: A component of D:\Data\WORK\SAS Temporary Files\_TD9908\file:\output is not a directory.
likely from the FILE: bit.
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