Hi Adriaan,
It has come to our attention that firmware 2.1.0 and 2.1.1 have a bug that causes the program data output to be incomplete when the number of programs is a multiple of 3. This will lead to the web interface not responding. Because you have 3 programs, I am pretty sure this is what’s causing the issue you have encountered. A fix has been released in firmware 2.1.2. You can check the related thread here:
https://opensprinkler.com/forums/topic/creating-a-third-program-stops-ui-access/#post-35016
Thanks.