Seems the amount of local storage for a browser is limited.
UBr would not save scenarios after I had about 40 loaded.
So I added the amount of space each scenario requires to the scenario list and an estimate of how much space there is left.
The scenarios take wildly ranging amounts of space to store, from 8KB to 1,195KB.
@mahks Thought you might like to know that I updated UBr and it works perfectly.