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I recently resolved a non-manifold issue as detailed in my answer here, but I have now made another issue for myself which I cannot seem to resolve.

I have been trying to reduce the amount of extraneous loopcut sections by removing parts I don't need and joining them up like in this tutorial but I failed and I decided I would try and use the knife to connect back up my loopcuts like before.

Everything was mostly ok, but then this face for some reason does not accept the knife tool. I can join the vertices following the knife tool but then these vertices are then highlighted under select> Select all by trait>non-manifold (where they can be selected only as 'vertices' within the option checkboxes).

Here are some screenshots of me trying to use the knife over it:

Drawing with knife knife

Result result

edit: As requested the file I am working on

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  • $\begingroup$ I've had this issue before, I'm not sure what causes it. :( $\endgroup$
    – Millard
    Commented Sep 1, 2019 at 13:33
  • $\begingroup$ Mind uploading? $\endgroup$
    – Jackdaw
    Commented Sep 1, 2019 at 14:45
  • $\begingroup$ Try to select all and remove doubles (in 2.8 now it's Merge by distance). Another possibility is that the vertex cutting is started from probably isn't part of the edge which is above it; then technically no doubles present but cutting won't work. Check if there's anything non-manifold before cutting. If you'd like to upload the file use blend-exchange.giantcowfilms.com and paste link here $\endgroup$
    – Mr Zak
    Commented Sep 1, 2019 at 15:06
  • $\begingroup$ Just added the file, see the edit $\endgroup$
    – Scott Anderson
    Commented Sep 2, 2019 at 0:33
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    $\begingroup$ I don't see anything special about that mesh. It happens that Knife tool won't cut some faces, in this case it might be due to faces being too distorted (non-concave) although not necessarily. You can use Loopcut tool and then join new loop with the window using Vertex Connect Path (shortcut J) like in example $\endgroup$
    – Mr Zak
    Commented Sep 3, 2019 at 15:46

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