ImageBrowser EX is indeed the replacement for ZoomBrowser EX. Although it would work from time to time, ZoomBrowser EX was not designed with network storage in mind and it would not consistently work with network storage on every system. ImageBrowser EX is the same way. While you may be able to see network folders, you may not be able to add them to the library.
I am not aware of what specific changes are going to be made to future versions of ImageBrowser EX, but I have passed this along to the appropriate party for review and consideration. We appreciate the feedback.