Good morning @anna.giuglietti , thanks for getting back to us. We’re glad to see you re-connected 
I’m also glad to hear you’re not experiencing this issue anymore, but I find it really suspicious that it would “just” go away by itself. If you ever still manage to reproduce it, please inform us opening another bug report. I will close this one in the meantime.
Please check the release notes BREAKING CHANGES section: delay has been redesigned and WILL sound different in 1.7 as announced. If you don’t want this, we recommend finishing current projects in 1.6 before moving onto 1.7 release. Tip: you can also save them with “1.6” name tag, so you will always know they have to be loaded in this version to sound correctly.
Also, Tempo FX have had changes as well and will behave slightly different: please read FIXES section in release notes for more info and let us know if you still have questions.
Thanks for your private message, I will check your projects and write you there.
We appreciate all the info you’ve given us so far, thanks for you support!