Creators of footage promoting the 2012 Olympics should not be paid after it emerged a segment could trigger an epileptic seizure, London's mayor said.
The official London 2012 Olympic logo was unveiled on Monday
Ken Livingstone's spoke out after some footage was taken off the organisers' website on the advice of experts.
Charity Epilepsy Action said it had received 22 calls from people who had suffered fits after watching the clip.
But the logo's designer has blamed poor promotion for the negative reaction to it, rather than the work itself.
However, Mr Livingstone said the designer should not be paid a penny for the "catastrophic mistake".
"Who would go into a firm like that again and ask them to do that work. This is a pretty basic thing," he said.
But Michael Wolff, of designers Wolff Olins, who created the logo, said it has not been "done justice" and blamed Olympic organisers for not publicising it properly.
"I think it's a great shame that it's been shown as a static thing, when it's quite a democratic thing capable of a lot of interpretations," he said.
The animated film, which was unveiled along with the logo for the London Games on Monday, is now being re-edited by London 2012.
Organisers said the footage removed concerned showed a "diver diving into a pool which had a multi-colour ripple effect".
The spokeswoman said: "We are taking it very seriously and are looking into it as a matter of urgency."
This is among the most popular logos from BBC News website users
After its release Prof Graham Harding, who developed the test used to measure photo-sensitivity levels in TV material, said it should not be broadcast again.
Simon Wigglesworth from Epilepsy Action said he was shocked at the choice of animation.
"The one thing most people know... about epilepsy is that flashing lights and flashing images can cause them problems.
"The reality is there is only about 5% of people with epilepsy for whom photosensitivity is an issue. That's still 23,000 people."
The new logo, which cost £400,000 to develop, has also been heavily criticised and more than 38,000 people have signed an online petition to have it scrapped.
The BBC News website invited users to send in suggestions for alternative logos, and has so far received more than 500.