Jasperreport 3.6 with JAVA 1.7

hello,

We use JASPERREPORTS 3.6 on WINDOWS.
The same PDF report generate under JAVA 1.6 and JAVA 1.7 give different results (see attached file).
This PDF look fine in iReport launch under JAVA 1.6 and JAVA 1.7.

Someone have some idea  ?