can't view pdf file in IE and Firefox,

[edward wang]

Hi, I am newer in ofbiz.
We have B2B application using ofbiz developed one year ago.
When i  looked at  a order in ordermgr/control/orderview?orderId=B2B12121.

There is PDF button to show pdf report. but it shows blank in IE, and some
corrupt mess words in FireFox.

I downloaded the latest version of ofbiz, it shows PDF well.
I am nor sure how to fix this issue, there is any setup? like encoding...

Thank you,

Chwang