Thanks Spencer, that helped a lot. I was able to determine that 13 out of 893 objects were in fact not polylines and this is what's hanging up the SQL select.
Thanks to Mike Cummings also for his suggestion, however I had already packed the table when I first got the error. Donald Guerra Municipal Authority of Westmoreland County P.O. Box 730 Greensburg, Pa 15601 724-834-6500 x182
