This is the same problem as witnessed last year. Searching the error you see symbol.iterator in the forum leads to this post: 🎉 Node-RED 2.0 Released - #43 by Steve-Mcl
That list of "known bad nodes" were all clones of one or the other and all of them had hard coded into them an old version of multiple-select.min.js that is polluting some prototype.
Could you search your .node-red directory and see if multiple-select.min.js can be found please?
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