I changed the code in widget-twitter.php by reversing the arguments to make it work.
With your standard code, if I enter a count of 5, I get the tweets for @5.
I know that someone else in this forum has this same issue and it was related to a lower level api function signature change. When they changed the signature, they made it backwards compatible by checking for an int or string for the count. In this case, the check is broken when the count is passed in 1 versus ‘1’.
I suspect that depending on where the count comes from and if it’s converted to a proper int, it’s broken but in other places it’s not. Gotta love dynamic languages ๐