I am on https://gemini.com/, and today (12/8/2017) I have noticed extremely slow withdrawals from my account in ETH to my desktop wallet. No such delays in BTC, which is the exact opposite from what we are told - Bitcoin's network is slow, Ethereum & Litecoin are fast, etc.
One other item of note: Exodus (https://www.exodus.io/) wallet has EXTREMELY HIGH transaction requirements today. .55061644 ($251.79) required to change ETH->LTC or OMG?!! That is unheard of! Exodus usually only requires you to have $8.00 or so ETH in your account to exchange using the built-in ShapeShift connection. I was able to go to https://shapeshift.io/#/coins and do ETH->LTC and ETH->BCH manually, at greatly reduced cost of $0.18 or so.
Education saved me money in exchanging ETH for another altcoin today.
RE: Is Anyone Having Issues Selling Their Bitcoin? Gregory Mannarino