version: Easy Populate 4.0.22 - Beta 6-10-2012

if sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION" (my.ini)
on the EP4 working page, export a completed products file, and then import it. you will get a error message in the log file as
MySQL error 1366: Incorrect integer value: '' for column 'products_tax_class_id' at row 1
.....
product_is_always_free_shipping = '0',
products_tax_class_id = '',
products_date_available = NULL,
....
I think the problem is that some default values for integer had not been set correctly(have not been set, set to empty...).

if sql-mode=
everything is OK.