I have just installed 2008 on a G5 Mac running OS 10.4. It has a B serial number and uses a dongle. After an initial successful run, it won't relaunch, saying that it needs a valid serial number. After reentering my number, it says that the number is not valid. After reinstalling the program it started up fine, but I have the same problem when I try to relaunch it.
Any suggestions?