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I'm discovering a number of minor issues in Mathematica Online and I'm going to report them.
Sander: no, I was really interested in computing the matrix of distances between symbolic vectors but I wasn't able to.
I'd suggest switching to MathJax (as in this community) since it is much faster and works much better than the current renderer (even before it crashed).
thanks Is Wolfram|One the minimal software package including all Mathematica functions? Or what else?