This is not a question as such, but certainly something which I would learn from if resolved. I have uploaded a shapefile of polgyons from multiple layers all merged into one. I have made sure the features are singleparts, checked validity of the geometry (which checks out) but still spits out an empty output. I've been trying to select half the features and dissolve twice to reduce the pressure put on the algorithm. I have tried v.dissolve but the same result occurs when using
vector>geoprocessing tools>dissolve...just an empty output.