Write \ get \\\\ in postgres issue

I changed HSQL database connection to PostgreSQL in BuiltInDS sample.

When I try to write backslash in any text field I get four backslashes in database.
I tried to change database parameter to standard_conforming_strings = off (default on)
and I got two backslashes when i wrote one.

OSX 10.9.4,
PostgreSQL 9.3.5.2
SmartGWT 4.1p (built Tue Dec 16 07:16:00)
all browsers