SQL Dev 3.0: Import Data Hangs

Hello,
I am using SQL Dev 3.0 Prod version on Windows 7, JDK 1.6.0_25. I am trying to import csv data file using the Import Data menu option under Actions in the Table Browser window. There are about 700 rows in the csv file and each time I try the Import wizard, map columns etc. and launch the Insert, SQL Dev 3.0 hangs. This happens with xls as well as csv files. Is this is a known issue? Do I need to increase memory allocation?
Thanks
