Hmm, that made me realize it's working in Linux but not on my Mac, with slightly different versions of Python and PyQt5:

Not working (on MacOS 10.13.6):
```
% flent --version
Flent v1.9.9-git-83d14d6.
Running on Python 3.7.4 (default, Jul  9 2019, 18:15:00)  [Clang 10.0.0 (clang-1000.11.45.5)].
Using matplotlib version 3.1.1 on numpy 1.16.4.
Using PyQt5 version 5.12.3.
```

Working (on Ubuntu 19.04):
```
$ flent --version
Flent v1.9.9-git-83d14d6.
Running on Python 3.7.3 (default, Apr  3 2019, 05:39:12)  [GCC 8.3.0].
Using matplotlib version 3.1.1 on numpy 1.16.4.
Using PyQt5 version 5.12.1.
```

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