Street names do not appear in "3D" mode and only appear in "2D" mode at high (detailed) zoom levels. If you have "auto scaling" (zoom level dependent on speed) selected in settings you may not see a detailed zoom level until you are almost stopped.

This happens with or without the license. Because this behavior is typical of crippleware or an inferior navigator, I can see how there is some confusion.

If you pay for any level of license you are still left with an inferior navigator but as pycage has stated, one that now has voice guided navigation.

BTW, although this Wayfinder app was commercially developed it is not a very good justification for buying a NIT. In fact it is so poor an example it might even be considered a liability if it were not for Maemo Mapper and other excellent free, open source, and community developed applications that you can use. (IMHO)