secure can't find burp application

hi,

i am new to portable apps so i just installed the base version and several apps. when i couldn't get toucan working i deleted everything and started again. now i only have the base version of portable apps and toucan installed.

[i am running windows xp and portable apps is installed on a usb pendrive]

i run portables apps from the system tray and click on the toucan icon to launch the application. i then goto the secure tab, add a file and a password and click encrypt. it tells me:

"toucan error" execution of command 'App\toucan\burp -eo-k"password" "filename" failed (error 3: the system cannot find the path specified)

i am no computer newb so i guess it doesn't know the folder toucan is running from and hence can't find 'App\toucan\burp'. this is proved because if i browse to the toucan app .exe (F:\PortableApps\Toucan\toucan.exe) and run toucan from here everything works fine.

i have tried installing toucan from both the portable apps menu and by clicking on the .paf.exe file but both routes have the same problem.

have i missed something or is this a bug?
thanks,
stewart