Stable update: Timeline improvements; Scripting autocomplete; Lots more.
I find my timelines from that last stable (157) broken when opened with this version. It plays only on the first time during preview, but upon reenter the layout it does not play. Is it possible that the this new "tag" feature is not compatible with the previous timeline without tag?
It should not have affected the behaviour of existing projects. We have had one reported issue related to timelines/tweens (they leverage the same core code) in the new release which might be the same issue as yours github.com/Scirra/Construct-3-bugs/issues/3296
Can you make a report in our bug tracker github.com/Scirra/Construct-3-bugs/issues ? I fixed the issue Nepeo was talking about, but from your description, your problem seems to be different.