This has happened to me several times: when I update my portable
copy of NVDA, if there is a pending update of Braille Extender,
two dialog boxes are displayed, one for Braille Extender Update
and one indicating that the portable copy has been successfully
created. Pressing accept in the latter should start the copy
created but it doesn't do. Seems that NVDA re-create the portable
copy and displays the two dialogs once again. It keeps looping
like this until the Braille Extender is updated.
I think the problem is in the dialogs, there are usually problems
when NVDA shows more than one at a time.