Also don't forget that the Pronto encryption key field in PEP2 is somewhat 'pooched'! The Pronto does not do a proper job converting from ASCII to HEX: Thus 'Senior Pronto' will refuse to connect or get kicked out of the club every time it makes a pass at your router!
If this is the problem: Don't turn off encryption permanently unless you want a long term relationship with a hacker. Copy the encryption key hex string from your router and paste it into your config. I had a similar problem and that solved it.
And if that isn't enough: There are rumours that the Pronto uses a G class wireless protocol.... If you've got an N class router you have a problem.
And on top of that: If you are trying to use WPA encryption on your router; Pronto doesn't do WPA only WEP.
You can hide almost anything until you have to put the drywall up!