Troubleshooting Disabled Run Button in Dust Agent Building

Hi all! I’m new to Dust and could use some help. I was building an agent and the Run button was working fine at first, I could run my blocks with no problem. But after I added a new dataset block, the Run button became disabled and now I can’t run anything. I tried in other browsers, cleared cache, and even created a brand new test agent with just a single Input block.. Run is still disabled. Is there a simple fix or setting I might be missing? Thanks so much for any tips!