Did you get a resolution for this problem? I'm only new to the forum and to Puppy so I've just found your query and it seems to have no response.I just installed slacko to replace puppy 529 because to be honest, it seemed slicker and better.
But one problem.
I have a wireless WPA2 router which connected fine with 529 but refuses to connect in slack.
I've had the same problem but was able to fix it by setting my wifi to WPA/WPA2 rather than just WPA2 and haven't had a problem since. Hope you have already found a solution, if not, I hope that helps, cheers,
Ray