That's a good point. My brokerage account got locked for several months. I could trade but withdrawal 0! It was the target of a TOD and the state of PA held it until the estate cleared their painfully slow, paper based tax system.
That was a real PIA. In my case it was just the account, but I could see how it could be the broker/fund co.
Glad the problem cleared up. Could have been a big issue if this account was needed for a big withdrawal. It's another reason why I keep lots of cash as well as multiple accounts. Just never know...