What type of infill do you use?

[printbus]

check the advanced settings - cura gives you a variety of different infill patterns. And even tells you which are better, take longer to print etc.
I'm guessing you've never used anything other than the 'basic' settings.
I believe it's default is rectilinear.

I'm in advanced settings all the time. Maybe my installation went wrong, but my first-time use of Cura was v14.07 and there's no option anywhere to set the infill type. Not on the Basic, advanced, or the expert settings.

EDIT: I also don't see selection of infill type mentioned in the on-line manual for Cura, current as of v13.11.2

EDIT #2: Today I found discussion in the user forum at Ultimaker that the ability to select infill type was removed from Cura at or around v13.04. That would explain the disconnect.