Windows Shares Not Showing Up On A Mac
One of the cause is that most likely it is because the size of the volume is too large. Older mac will not function correctly and it will take longer for the shares to show up.
Below is an error you might see once a share is up
Event ID: 12057
Number of files and folders in volume “%1″ is greater than 65535.
Older Macintosh clients may not function correctly in this situation due to
Macintosh volume limitation.