Most of the time that's a reference to 'mapping a drive' or assigning a drive letter to a network share. In this context it seems odd that a network map has an effect.

There are issues with long directory names in old applications but the usual is to not exceed 8.3 naming conventions. The reason Pro might differ is that some directory is over the 8.3 naming or the 8.3 support was turned off. Think about that. I won't write more about 8.3 since you can use the web to learn about that.
Bob