Cannot enter numbers with numeric keypad

Whenever I access https://trade.loginandtrade.com/itp/siteselector_STRADE.asp on Ubuntu my numeric keypad behaves as if the NUM LOCK is disabled, whether it is or it isn't. It works fine in other applications and in Flash in Windows 7.

I can enter numbers from the "top row" of the keyboard but this is a hard habit to break, and really should work as planned anyway.

Not sure what other details I can provide.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: flashplugin-installer 11.2.202.236ubuntu0.12.04.1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Fri Jul 6 15:27:37 2012
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: flashplugin-nonfree
UpgradeStatus: Upgraded to precise on 2012-06-26 (9 days ago)