On Verbum/Mac:
This indeed appears to be a bug that is also present on Windows. It does not appear to be resource-specific. It is also not specific to the beta version.
After performing an inline search, the back button often fails to clear the search results and return to the book on the first attempt. However, there appears to be a workaround. If you hit the back arrow, then the forward arrow, then the back arrow again after performing an inline search, the back arrow will often work as expected the second time it is pressed, clearing the search and returning to the book.
Good catch on a workaround @Aaron Hamilton !
Thanks for the report; I've opened a case to get it fixed.
Thanks @Adam Borries (Logos) !