I think the 100001 issue may be relating to me testing IE and FF in parallel. I have now rebooted and with a fresh FF window still get the same lack of logging and the same hang. I have made the change to use AWT and this shows in the logs.
However - and this may be a clue, if I wait a while and then refresh the browser I suddenly get a raft of ftp logging in the java console
This is the debug up to the point of hanging. I have selected a file and clicked OK / Save in the dialog
Java Plug-in 1.6.0_29
Using JRE version 1.6.0_29-b11 Java HotSpot(TM) Client VM
User home directory = C:\Users\afrench
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
Integral FTP (c) 2007 Enterprise Distributed Technologies Pty Ltd. Trial version 4.0.1 (built 1-Aug-2011 11:30:12 EST)
DEBUG [AWT-EventQueue-4_FTPApplet] 3 Nov 2011 14:58:17.170 : Licensed for domain: integralftp
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.176 : LogLevel=DEBUG
Integral FTP log level is DEBUG
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.176 : FTPApplet being initialized...
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.180 : minPoolSize = 1
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.181 : maxPoolSize = 5
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.182 : Created FTP client
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.183 : Document host = customersupportportaltest
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.187 : FTPApplet initialized
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_JSWrapper] 3 Nov 2011 14:58:17.387 : Javascript invocation: setTimeout("FTPClient_onInitialize('0', -1,null)", 100)
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.392 : FTPApplet starting...
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPAcceptor] 3 Nov 2011 14:58:17.395 : Started listening on port 60422
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPAcceptor] 3 Nov 2011 14:58:17.397 : Started listening on port 60423
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 14:58:17.397 : FTPApplet started
DEBUG [Thread-44_LocalFSProcessor] 3 Nov 2011 14:58:17.402 : Running LocalFSProcessor
INFO [Applet 3 LiveConnect Worker Thread_FTPApplet] 3 Nov 2011 14:58:18.496 : LogLevel=DEBUG
DEBUG [Applet 3 LiveConnect Worker Thread_DialogManager] 3 Nov 2011 14:58:20.713 : Creating dialog, com.enterprisedt.net.ftp.applet.dialog.AWTFilePrompt[2]
DEBUG [Applet 3 LiveConnect Worker Thread_FTPApplet] 3 Nov 2011 14:58:20.717 : Adding result 1000000 - com.enterprisedt.net.ftp.applet.dialog.AWTFilePrompt
DEBUG [Applet 3 LiveConnect Worker Thread_DialogManager] 3 Nov 2011 14:58:20.717 : Queueing dialog, com.enterprisedt.net.ftp.applet.dialog.AWTFilePrompt[2]
DEBUG [Applet 3 LiveConnect Worker Thread_DialogManager] 3 Nov 2011 14:58:20.723 : Starting dialog thread
DEBUG [DialogManager_DialogManager] 3 Nov 2011 14:58:20.753 : Popped dialog from queue, com.enterprisedt.net.ftp.applet.dialog.AWTFilePrompt[2]
DEBUG [DialogManager_DialogManager] 3 Nov 2011 14:58:20.753 : Showing dialog, com.enterprisedt.net.ftp.applet.dialog.AWTFilePrompt[2]
DEBUG [AWT-EventQueue-4_FilePrompt] 3 Nov 2011 14:58:20.758 : componentMoved
DEBUG [AWT-EventQueue-4_FilePrompt] 3 Nov 2011 14:58:20.759 : componentShown
DEBUG [AWT-EventQueue-4_FilePrompt] 3 Nov 2011 14:58:20.760 : windowOpened
DEBUG [AWT-EventQueue-4_FilePrompt] 3 Nov 2011 14:58:23.567 : componentHidden
DEBUG [AWT-EventQueue-4_FilePrompt] 3 Nov 2011 14:58:23.567 : Dialog closed com.enterprisedt.net.ftp.applet.dialog.AWTFilePrompt[2]: crashreporter.exe
DEBUG [DialogManager_DialogInfo] 3 Nov 2011 14:58:23.577 : Acquiring lock 1
DEBUG [DialogManager_DialogInfo] 3 Nov 2011 14:58:23.577 : Acquired lock 1
DEBUG [DialogManager_DialogInfo] 3 Nov 2011 14:58:23.577 : Releasing lock 1
DEBUG [DialogManager_DialogManager] 3 Nov 2011 14:58:23.577 : Dialog shown
DEBUG [DialogManager_DialogManager] 3 Nov 2011 14:58:23.578 : No dialogs queued. Waiting...
DEBUG [AWT-EventQueue-4_JSWrapper] 3 Nov 2011 14:58:23.768 : Javascript invocation: setTimeout("FTPClient_onDialogResult('0', 1000000)", 100)
DEBUG [AWT-EventQueue-4_FilePrompt] 3 Nov 2011 14:58:23.769 : windowClosed
DEBUG [Applet 3 LiveConnect Worker Thread_FTPApplet] 3 Nov 2011 14:58:23.867 : Found result for task 1000000 of type com.enterprisedt.net.ftp.applet.dialog.AWTFilePrompt
This then follows a "F5" refresh in the browser
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 15:02:45.761 : FTPApplet stopping...
DEBUG [Thread-44_LocalFSProcessor] 3 Nov 2011 15:02:45.853 : LocalFSProcessor stopping
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPHandler-13] 3 Nov 2011 15:02:45.854 : Shutting down handler
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPHandler-14] 3 Nov 2011 15:02:45.854 : Shutting down handler
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPHandler-15] 3 Nov 2011 15:02:45.854 : Shutting down handler
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPHandler-16] 3 Nov 2011 15:02:45.854 : Shutting down handler
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPHandler-17] 3 Nov 2011 15:02:45.854 : Shutting down handler
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_HTTPHandler-18] 3 Nov 2011 15:02:45.854 : Shutting down handler
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 15:02:45.855 : FTPApplet stopped
INFO [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPApplet] 3 Nov 2011 15:02:45.855 : FTPApplet being destroyed...
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPTaskProcessor] 3 Nov 2011 15:02:45.855 : shutdown(true) called
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPTaskProcessor] 3 Nov 2011 15:02:45.855 : Interrupting FTPThread_edt_0
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPTaskProcessor] 3 Nov 2011 15:02:45.855 : Interrupting FTPThread_edt_1
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_FTPTaskProcessor] 3 Nov 2011 15:02:45.855 : Interrupting FTPThread_edt_2
DEBUG [thread applet-com/enterprisedt/net/ftp/applet/FTPApplet.class-3_