Hello everybody, 

I am really glad to have found this forum. I have been working with inkscape for several years now and would really appreciate to have others to chat with. 

And I have a problem, I found no solution yet. 

For the draw a knot challenge, (https://inkscape.org/forums/competitions/draw-a-knot-challenge/) I tried to creat a celtic knot, using a rope-like strukture. 
Works quite fine, as you can see in the attached files. But there are two areas in which the pattern seems to be kind of broken, now matter how I try to smooth out the nodes. 

Does anybody have an idea on how to fix this?

It happenes in the latest inkscape versions as well. 

Are you using the Generate from path>pattern along path  --- extension 

or

Path>Path effects>Pattern along path --- live path effect ? 

The upper circle indicates an issue where two nodes can be joined into one.

Comparing the node at the lower circle to its two similar corners of the know shows it is a cusp/corner node, rather than a smooth node.

Thanks for your answers.

@TylerDurden  yes, you found the problem. I thought, that I had smoothed all nodes, but obviously I forgot one. And the other node were indeed two of them.

@inklinea I used the Path > Path effects > Pattern along path. Would it be different, with the extension?​​​​​​