Can no longer put events at beats, only at bars

Suddenly I can no longer put events (notes, sounds, chords etc.) at a beat, except if it coincides with the start of a bar. The problem also occurs in new projects. It can’t be Quantize, because that is not set to 1/1, but e.g. to 1/4.

I probably inadvertently changed a setting, but can’t figure out which one.

You might have changed the Global Quantize to Bar instead of Use Quantize.