Trendlines don't save

 
Hello!

When I draw a trendline and switch to another timeframe then the trendline is gone. Even on the oroginal timeframe. I don't think it always was like that. I didn't change anything on the programm (at least not on purpose)
I dont want to reinstall because of the many templates and custom EA's I am using.

Is there a solution to this?

Thank you for any help,
alex