Titanium backup issue with Lollipop topic

Hi,

I have upgraded my note 4 to Lollipop stock rom and have rooted it.
Titanium backup Pro doesn't work when the destination backup directory is on the
external card. It says : «the folder is not writable» although I can manually copy files to my external Card and to the the Titanium Backup folder using a file manager like Total Commander.

I had before the same issue with Kitkat and have applied the SD card fix permission. But this application doesn't work with Lollipop.

Any help please.

Thank you,

Daniel