After upgrading to the latest version of job-dsl, the api-viewer no longer functions. The site comes up but it forever displays the "Loading data..." message. I've checked the logs and see no errors. I suspect there must be some bad interaction between the new version of the job-dsl plugin and some other plugin installed on the system because I have a nearly identical Jenkins server except it doesn't have the complete set of plugins installed and it displays the API Reference fine. I know this bug report is very vague but I'm happy provide any additional information as requested. If there is a way to determine what the "Loading data..." is busy doing, that would be excellent but nothing is jumping out at me in the thread info.