Hi Jos
Because I use Windows' own UI controls as far as possible and because Windows' column header has a maximum width of about 32000 pixels I have to control the width of the time periods to not exceed this.
The only solution (at present) may be to filter your tasks by due date to reduce the task date range, but it's possible that the parent width is still going to cause problems.
I will give it more thought as to how I can best solve this.