Can´t connect to WiFi when other Mac users can (in Spain)

Two days ago I went to a coffeeshop with free wifi in Spain and had no trouble using my Airport menubar logo to log on using their network and password. Just type it into the box, press Return, and presto, no problems.
Today I get Connection timeout errors when I try to do the same thing. When I change the password to something wrong, I get an Invalid Password error, so I know I´ve typed it correctly. I change it back and it goes back to Connection Timeout. Sometimes it waits a moment, sometimes it takes awhile, but it´s always a timeout.
Other Mac users report no problems. I do exactly the same thing as they do (modulo differences in the language of the menus, of course) and they connect with no problems.
The cafe changes its procedures periodically to be sure that only customers can connect. The key difference this time seems to be that they specify that the password be WEP 128 bit ASCII. When I use the little Airport logo in the menubar, it doesn´t let me specify this. When I access the Network Diagnostics to specify this, I type in the 10'character password and the Join button is greyed out! It becomes clickable only with a 5 character password. So I tried just the first 5 characters of the password... and again it times out.
HELP! As you can imagine, all the cafe personnel can only suggest that I reboot and try again.
What kind of system setting might be different on Macs in Spain versus my Macbook Pro from the U.S. that would cause this frustrating behavior?

Thanks, Henry. I didn't mean to suggest that engineers were the SOLE cause of the problem. Some of my best friends are engineers (grin)! And thanks for the link to the Apple explanation page.
But it still frosts my shorts to pay extra for a WiFi card which won't work in certain countries under certain conditions, without any advance warning. And the same goes for countries which have so-called "experts" (the WiFi guru for that cafe, for example) who don't seem to know about the limitations of their country's implementation of a supposed international "standard."

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