MarianoGF
Can't log into BandLab Assistant 3.2.0 since last week in none of my two Windows 10 PCs.
I kill the process and try again, but it doesn't work. Fortunately I can use Cakewalk anyway.
I was getting the same (well, not the JavaScript error - that happens when you try to run BandLab Assistant again when it's already running), but the 401 error was happening regularly.
Clicking Back to Login and logging in again worked most of the time, but not always.
HTTP error 401 is a login unauthorized error, so it occurred to me I might be still logged into BA Assistant on my laptop... shutting down my laptop solved it.
So the answer is don't have BA assistant logged in on more than one machine at once.