Comment by syntheticnature

I ran into that once with my credit card company. I used a generator to create a maximum length password, only to discover that the Javascript managing the login had an off-by-one error and wouldn't accept that length. I was able to work around it through judicious use of browser inspection tools -- the change password page accepted it just fine.

I sent in a complaint and got something to the effect of "well, no one else reported it."