This question already has an answer here:
I'm fairly new to QGIS and I'm trying to use Heatmap. I should be doing every thing correct. But when I click OK for it to generate a heatmap, there is no Heatmap at all (nothing changes).
For the points I created a New Shapefile and then I used "Add Feature" button to add many points to the map. The only thing I can think might be causing the problem is I'm adding points to map the wrong way perhaps.
I have the latest version of QGIS 2.8.1
When i zoom out to the world view I can see a giant 1/4 of a heat map circle at the bottom right of the map. So i was thinking the map coordinates (CRS) might be different, but they are really set to the same map coordinates (CRS). So I don't know what is going on.
EDIT: It also was doing this in an older version I had, so last night I download the latest version (maybe should not have) hoping it would help and nothing changed.