Wakoopa can't connect to the Internet, but other apps do so without problem

I have downloaded the Wakoopa tracker, and have opened a Wakoopa account, but when I run the Wakoopa tracker and attempt to log in via the opening "Welcome to Wakoopa" dialogue, I get an error message stating that Wakoopa can't make a connection to the Internet, and I am offerred the opportunity to add proxy settings (but I don't use a proxy server!).

I have an XP machine that is behind a standard Linksys router attached to a DSL modem, and no other software on my machine has problems connecting to the Internet. I have rebooted and stripped down the number of running apps, but to no avail. I have Googled (etc.) for others reporting a similar problem, but have not found any useful hits. Are there known reasons for this connection-failure behaviour, and if so, what remedies exist? Thx!