While testing our new game (applet), we found that right-clicking outside the window on the web page hosed the 1.4.2_01 VM. Works fine with my 1.4.2_04 VM, but not this machine with the _01. So we installed the latest version from the Sun site (1.4.2_06).
It all works nicely now.
BUT: Using the Sun Plug in to select a previous VM version is now totally broken! Any applets we try to access with the _01 versionnow chuck an exception - something to do with a ProxyManager!
Its a real shame as we need to switch VMs to test various versions & their 'idiosyncracies', but installing the latest one has completely bust them