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Standalone HydraCALC (Location)
Description:
When printing a final calculation, the font doesn't show fraction symbols for ¼ (quarter), ½ (half), or ¾ (three-quarters)
They're replaced with ?.840, ?1.050, and ?1.660

These should look like this;

Of note, if using HydraCAD for AutoCAD, you get similar results on riser nipples/vertical pipes

Unknown at this time
You should be able to replicate the issue by clicking the pipe schedule tool and reviewing the diameter headings.

Versus

The only solution shared at this time was the user reset Windows 11 to default/factory settings and the situation resolved itself
(thanks Spencer B)