IcedTea Java Plugin and WebKit browsers

[AnonymousCloud]

Hi, I'm trying to access to http://www.tatasteelchess.com/tournament/livegames with some minimalistic WebKit-based browsers (LuaKit, DWB, Jumanji and UZBL) but the Java applet doesn't show up.

In Gecko-based browsers (Firefox and Conkeror) and WebKit-based Chromium it displays flawlessly.

If I try the Java tester page http://javatester.org/version.html I can see my Java listed correctly: "Java Version: 1.7.0_09 from Oracle Corporation" (I get the same output with Firefox and Chromium).

It happens I have 2 different IcedTeaPlugins installed:

~ $ locate IcedTeaPlugin.so
/opt/icedtea-web-bin-7/lib64/IcedTeaPlugin.so
/usr/lib64/icedtea7-web/lib64/IcedTeaPlugin.so

~ $ java-config --list-available-vms
The following VMs are available for generation-2:
1) IcedTea JDK 7.2.3.3 [icedtea-7]
*) IcedTea JDK 7.2.3.3 [icedtea-bin-7]

~ $ ls -l /opt/icedtea-web-bin-7/lib64/IcedTeaPlugin.so
-rwxr-xr-x 1 root root 213056 14 nov 23.04 /opt/icedtea-web-bin-7/lib64/IcedTeaPlugin.so

~ $ ls -l /usr/lib64/icedtea7-web/lib64/IcedTeaPlugin.so
-rwxr-xr-x 1 root root 213272 27 nov 22.21 /usr/lib64/icedtea7-web/lib64/IcedTeaPlugin.so

# eselect java-nsplugin list
Available 32-bit Java browser plugins
Available 64-bit Java browser plugins
[1] icedtea-7
[2] icedtea-bin-7 current

And it happens that Firefox/Chromium run the correct one (/opt/icedtea-web-bin-7/lib64/IcedTeaPlugin.so), while Luakit/DWB/etc. the wrong one (/usr/lib64/icedtea7-web/lib64/IcedTeaPlugin.so).

Should I get rid of the wrong one?
If so, may that affect the correct Java Plugin?
Any other suggestions?

Thank's in advance.

EDIT: WebKit version: net-libs/webkit-gtk-1.8.3-r200