Roast Time 4.1.2 for mac doesn’t show the lines on the graph during the roast, it works in all other aspects, it communicates with the roaster it shows the temp and other feedback from the roaster just no lines. I can upload a screen shot of roast time during the roast.
Close the app and reopen.
From what I understand you were on an older Comms version of the app.
Please restart it to let it update to 1.5.0