Austin-Smith: Lord is investigating the collapse of a false ceiling at its £10 million cinema and arts venue, the FACT centre, in Liverpool.
The practice - together with contractor Mowlem - aims to discover why the ceiling failed and when the centre's three main screens will be safe to open to the public again.
But a FACT spokesman has questioned the motives for the investigation, claiming that 'no one seems to want to take responsibility for the problem'.
The temporary closure was triggered by the collapse six weeks ago of the false ceiling in the complex's Screen 3. The other two screens were closed immediately for safety reasons.
It is understood that these will be open by the end of July, but there is still no re-opening time scheduled for Screen 3.
The spokesman said: 'All we really want to do is find out how long this problem will last and when we can open the third screen.'
Austin-Smith: Lord project architect Alistair Sutherland said the investigation was proceeding well and that its major conclusions will be published soon.