There's this general problem:
My password was too long for Sync and Voyager and now also Boost; I've been using Jerboa since it worked in that client.
Since Boost also had the issue I changed my password to a shorter one.
The old one was something like
Friday-Ramble-Patriot-Apricot5-Tractor-Litigator-Shove-Antivirus
... and the new one is shorter and is causing no issues.