@AndyR Welcome to OpenSprinkler!
Sorry for the initial problems you were having but hopefully we can help. In regard to firmware 2.0.9, the issue is likely the interval time. This is common pitfall of the previous firmware’s and was required to be non-zero to actually run a program (set very high to prevent a repeat).
For the current firmware, I found and fixed this issue when trying to select the days of the week in the program editor. You shouldn’t need to do anything except refresh the page in order to see the updated result. Please let me know if this resolves the issue.
Thanks!