FT3 doesn't display rivers

When I use the button Show Rivers, none are showed on the map.
When I check the box "Potential rivers" they appear on the map but when I click OK, they disappear .
When I don't check this box Nothing is shown and after OK Nothing is shown either.
The problem is the same regardless of coarse or very fine setting I tried.
It is also the same regardless whether I create a new world or import a binary file.

As I have changed my computer and the river feature worked normally on the previous one, I Wonder if it is not a compatibility problem. Or I may have forgotten Something.
My new system is :
Windows 10
I7 5930K CPU
Geforce GTX 980 GTI
RAM 32 GB

Please help with this problem because FT3 became pretty useless for my mapping now.
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