@John K: I figured out why the Json data is incomplete when you have a large number of programs — apparently by default the Arduino Ethernet library (which supports W5500) limits each ‘send’ to a maximum of 2048 characters — even though OpenSprinkler firmware’s send buffer is 8192, the library caps the number of characters to send each time to 2048. As a result, when you have a large number of programs, it’s being truncated so the Json data is incomplete (therefore the homepage can’t render correctly). UIPEthernet (which supports ENC28J60) does not have this limit. Gotta love how different libraries make different assumptions. Anyways, it’s an easy fix and I will update the firmware shortly to increase this limit and that should address the issue.