OK, I have had some success. A trailing slash, ".../ibays/" or ".../ibays" both seem to work.
I was finally able to access the files I want, but only if I apply "All backups" from the drop down menu in the Selective File Restore page. I cannot choose the backup I want, only one of the backups yields files from the filter -- not the backup I want. If I choose any of the other backups, I cannot get any files with the filter. I was once able to do a full restore from one of these backups once.
So I selected the directory (no trailing slash) I wanted to restore, hit restore, and got the following message back,
Restore in progress
The following files and directories have been restored:
Cannot restore any file, nothing done
Restore complete
What does that mean and what should I do to correct it?