Proxy.pac script is bad parsed since JRE 6u15

FULL PRODUCT VERSION :
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
We have a proxy.pac file set to access URLs in our internal network.

Since the installation of the JRE 6u15 and next 16, I have a problem.
Indeed, I launch a SWT client or an applet on my IE8 browser and the proxy.pac script used seems to be bad parsed since the installation of the last JRE 6 build 15 or 16. Consequently, my SWT client is never refreshed even if I deliver new JAR versions and the URLs called in my applets cannot be accessed.

My colleague has the JRE 6u14 version installed and has no problem. I hadn't no problem with the JRE 6u14 too.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Install JRE 6u14 and launch an applet or a SWT client with a proxy.pac script to access URLs. All is ok at this step.
Install next the JRE 6u15. Deliver a new version of the SWT client or relaunch applet.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The new JARs versions of the SWT client are reloaded and the URLs called during the applet exection are accessible.
ACTUAL -
The new JARa version of the SWT client are not reloaded and the URLs called during the applet exection are no longer accessible.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
No specific error message, proxy.pac parsing problem and so URL not accessible

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
  To refresh SWT client JAR, I must use "DIRECT connection" in the JAVA controle panel console.
For the applet, no workaround.

Or remover JRE 6u15 or 16 and keep the JRE 6u14 version.

Release Regression From : 6u14
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.