dapper jpilot sync problems

[Dave S]

dmesg gives ...

[4298265.783000] visor 3-1:1.0: device disconnected
[4298266.739000] usb 3-1: new full speed USB device using uhci_hcd and address 
24
[4298266.871000] visor 3-1:1.0: Handspring Visor / Palm OS converter detected
[4298266.871000] usb 3-1: Handspring Visor / Palm OS converter now attached to 
ttyUSB2
[4298266.871000] usb 3-1: Handspring Visor / Palm OS converter now attached to 
ttyUSB3
dave at dave-comp:~$     

However all attempts at /dev/ttyUSB2 or 3 almost always fail. 

On two occasions I have had my zire 31 sync, but I cannot reproduce it no 
matter what combinations of syncing, pilot-xfer, kpilot or jpilot I try :(

dave