Ran exactly once

[EZWoodworker]

The Reload Heatmap Image worked just once, and now doesn't appear to do anything. The Perform Bed Level and Check does work every time. I have it loaded on a RPi Zero W. I am using Chrome. Also does not work using Edge or Firefox.

[aderusha]

I'm seeing the same results on an RPi3B+. "Perform Bed Level and Check" triggers the bed level process (G80), but the mesh only appears once after each restart of the Octoprint service. "Reload Heatmap Image" does not appear to do anything.

Logging seems to indicate that the heatmap is in fact being generated:

2019-06-04 14:22:23,162 - octoprint.plugins.PrusaMeshMap - INFO - FOUND:   0.03950  0.14950  0.26050  0.14750  0.03750  -0.24600  -0.49200

2019-06-04 14:22:23,170 - octoprint.plugins.PrusaMeshMap - INFO - FOUND:   0.17000  0.22050  0.25850  0.14350  0.03300  -0.20150  -0.57450

2019-06-04 14:22:23,175 - octoprint.plugins.PrusaMeshMap - INFO - FOUND:   0.19100  0.23900  0.25350  0.11825  0.02050  -0.24250  -0.63300

2019-06-04 14:22:23,179 - octoprint.plugins.PrusaMeshMap - INFO - FOUND:   0.24850  0.17350  0.15900  0.05550  -0.12087  -0.36200  -0.72400

2019-06-04 14:22:23,187 - octoprint.plugins.PrusaMeshMap - INFO - FOUND:   0.18500  0.17750  0.10750  -0.05812  -0.19750  -0.42950  -0.81500

2019-06-04 14:22:23,191 - octoprint.plugins.PrusaMeshMap - INFO - FOUND:   0.17350  0.12550  0.01700  -0.19800  -0.32150  -0.55250  -0.88750

2019-06-04 14:22:23,199 - octoprint.plugins.PrusaMeshMap - INFO - FOUND:   0.10000  0.01300  -0.13000  -0.34650  -0.50250  -0.74550  -0.99800

2019-06-04 14:22:23,200 - octoprint.plugins.PrusaMeshMap - INFO - Generating heatmap
2019-06-04 14:22:28,617 - octoprint.plugins.PrusaMeshMap - INFO - Heatmap updated