Heatmap and surface plots no longer working

[mcrone]

Thank you for a great tool and this is probably something that is non-urgent as the core code still seems to work.

When trying to produce heat map and surface plots using the template I end up with a uniform value across all values:

I initially thought that there was a problem with my code, but when running one of your notebooks (10_PFR_mixed_type_inputs.ipynb) I see the exact same behaviour:

My assumption is that this is probably just a dependency issue. The optimal values still seem to be correct and so it doesn't seem to be a problem that affects the underlying data processing.

[tmargary]

I have the same issue.

[jgoogasian]

I'm also running into the same issue. Has anyone found a fix?

[JJLLWW]

This was inroduced in ee8df8e, don't know how to fix