Could you please try resetting the preferences of Photoshop & let us know if it helps:
To restore preferences quickly using a keyboard shortcut: Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop.
are you using Photoshop 2017 for any particular reason? If you are using 'High Sierra' on your Mac-don't know if you are as you haven't said-but there are known incompatibilities with the new OSX and Photoshop 2017.
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How are you making it "Fill". If you are using the Edit Fill feature (Shift F5) it could be defaulting the fill option to Pattern, and that just happens to be the last one referenced.
Same thing with your paintbucket tool. If the option is set to fill with pattern rather than foreground color.
Yes, this worked! Thank you very much!
Hi, usually when something strange happens, just reset Photoshop preferences and it solve the 90% of problems. :-)
All my best,