Hi,
thanks for the quick answer. I know that post and I don't think that's the solution. What's disappearing is not the separators that were put in manually. If you go from weekly to larger timescales, such as monthly, quarterly or yearly, the vertical lines separating the time units disappear, which makes it harder to estimate where certain tasks start or end, especially if you have quite a lot.
If I could put in separators at distinct timepoints/dates I could put a line everywhere a month/quarter/year starts. However, manual separators seem only be possible to be set relatively to tasks or milestones and that's making it even more difficult to separate the time units with them.
I am guessing it is somehow connected to the timeline, but I have not figured it out yet.
Regards,
J.