In a statement to the Herald, Lightbox said the service was "running smoothly" this morning .
"Lightbox implemented a platform technology upgrade yesterday morning. The upgrade overall went smoothly and throughout the afternoon and evening, the majority of Lightbox customers were able to log in to the new platform and access their favourite TV shows and movies," it said.
"However, the new platform did experience a technical issue for a couple of hours yesterday evening. While the majority of viewers would not have noticed any impact, a number of people were unable to access Lightbox or experienced degraded quality when watching content.
"We apologise for the frustration that Lightbox customers experienced who were keen to watch The Handmaid's Tale last night."
The service also apologised in a series of tweets, calling it an "unforeseen issue" and apologising for "any inconvenience".
Lightbox trumpeted its upgrade in a press release issued yesterday lunchtime, saying the platform was now able to offer standard and premium plans.
It also allowed usage across four screens on one account, as well as a movie rental service, a slicker interface and a kids platform.
The Handmaid's Tale is one of the year's most anticipated shows, with episode five of the second season due to be made available on the streaming service from last night.