From one moment to the other I cannot create any polygon anywhere on the map, independent from the layer I am in, even if I create a new shape-file. I have checked all snapping options, enabled them, disabled them completely, restarted everything, etc. but no matter what I do this message pops up:
The feature cannot be added because it's geometry collapsed due to intersection avoidance
It's super weird because even if I create it in absolutely blank space it tells me that the geometry collapsed. It occured when I had print composer open and modified a polygon. I moved the knots of one polygon and then wanted to create a new one which did not work. I checked the polygon of which I had moved the knots 400 times...there is no flaw and no intersection. Frustrating.
I am using QGIS 3.4 Madeira