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In QGIS 3.36.1 I have a weird situation as my QGIS canvas is irresponsive to layer on/off and preset theme visualization. It used to work well, but now it is unusable, even after restart.

Cache?

What can it be?

Even from the Python Console, I cannot update the canvas, e.g.:

iface.mapCanvas().refresh()
iface.mapCanvas().refreshAllLayers()
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  • Whatever I do, like create a new vector layer and edit it, will not be shown but still there and saving edits even I do not see them while I draw them. It seems as though a fixed theme visualization prevents the canvas to update. I am lost
    – Federico Marcantognini
    Commented Aug 24 at 8:29
  • Is there "render" checkbox in the bottom right checked?
    – bugmenot123
    Commented Aug 24 at 9:09
  • @bugmenot123, yes. Whatever I do, with the layers, nothing happens on the canvas. Sounds like a red flag bug to me.
    – Federico Marcantognini
    Commented Aug 24 at 9:19
  • Tested the same file in another windows machine, same issue - canvas stuck showing a theme without responding to my changes in the layers panel or when do any sort of editing.
    – Federico Marcantognini
    Commented Aug 24 at 9:46

1 Answer 1

Reset to default
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So I looked into the XML version of the file and discovered this attribute that prevented any edits in the canvas. When removed by hand, all went back to normal. Not sure why/how, but editing the XML directly was the only way after deep checks.

enter image description here

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