I was able to re-create the issue starting from fresh. My process was this.
1- Uninstall all xlights.
2- Install xlights 2016.56
3- Create outputs, models, groups, then create 30 second color wash sequence (02-colorwash2016.xml)
4- Save to fseq
5- upload fseq to FPP with appropriate controllers configured, create playlist, play. Sequence plays fine, no blanking during a 'repeat'
6- copy CH drama club 2016 setup into another folder called CH drama club 2017
7- install 2017.7 on top of 2016.56
8- open 02-colorwash2016.xml and save as 02-colorwash2017.xml and associated fseq file
9- upload 02-colorwash2017.fseq to FPP, creat playlist, play. Sequence blanks at the very end of the sequence before repeating.
10- uninstall xlights 2017.7
11- re-install xlights 2017.7 , create new working directory from original 2016.56 directory as above, same results with fseq.
12- uninstall xlights 2017.7
13- install xlights 2017.8 , create new working directory from original 2016.56 directory as above, same results with fseq.
Here are the working directories and all associated files.
https://1drv.ms/f/s!AgkqIQkY6VrCqF71Y39yhCKHXkzCI'm happy to answer any other questions.
Charlie