Cannot select a source

[is0lde]

I am trying to set up a back up job.
I select a share such as Media, but It does not ask me to test connection - as if its not recognising the path..
I can select the destination - another NAS on my network, and successfully test the connection.
I cannot apply any of the settings so I cannot create the backup job.
What am I doing wrong?

[de_niro]

This issue should not be existing in firmware 5.3.7 ,can you try other web browsers?such as Mozilla or Chrome