There is indeed an issue with polygonal fields in PVsyst 7.2.6 and the fix will be available in the next version.
In the meantime, here is a workaround to avoid the error:
- Open a project variant that does not contain polygonal fields
- Open “Near shadings” dialog
- From the top menu, select “View”, “View options”, and uncheck “Show modules”.
You will then be able to reopen shading scenes containing polygonal fields.
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