UPDATE: Apparently the monorail became disabled and the air conditioning units lost power, so the windows were removed from the inside to allow for air flow inside the cars. The monorail was not moving and the windows did not fall out, as the Instagram user claimed.
This evening at around 8 pm EDT, a user on Instagram reported that a number of windows fell out of Monorail Lime while on the Magic Kingdom monorail beam. Below are screenshots from a user on Instagram who caught the monorail with some of the windows popped out. After taking photos of the monorail and the monorail tow vehicle, he was asked to leave the station and stop photographing.
The monorail was disabled on the track and the diesel-powered tow vehicle assisted the monorail into Magic Kingdom Station.