My gradient properties are completely broken...

Hi @Yannick van Dorp

Thanks for sharing the screenshot and details. A couple of things we would like to clarify and try:
 • Can you let us know what workaround you are currently using for this issue? That will help us understand your case better.
 • Have you tried the suggestion from Ged to reset Photoshop preferences? Remember to back up your settings first.
 • If the preference reset does not resolve the problem, please try renaming the UXP folder and restarting Photoshop:
Navigate to Library/Application Support/Adobe/UXP and rename the UXP folder to ~UXP.
 • If the issue persists after trying the above, please share your full System Info. You can copy and paste it from Photoshop’s Help > System Info menu directly into a reply here.

Let us know how it goes.

Best,

Anshul Saini

@Yannick van Dorp try manually resetting your Photoshop preferences
https://helpx.adobe.com/ie/photoshop/using/preferences.html#Manually
Remember to back up your settings before doing the preference reset
https://helpx.adobe.com/ie/photoshop/using/preset-migration.html