"Following routine safety checks last weekend a potential problem came to light," a spokesman said in a email. "Therefore it was decided to move the dress rehearsal of Xerxes to Wednesday night to allow for stage maintenance which was carried out. "
Tonight was to be the first performance of a revival of Nicholas Hytner's acclaimed 1985 production of Xerxes. The production is scheduled to continue on November 19 and run through December 15. No other performances were affected.
Katarina Karn_us sings the title role of Xerxes; Noel Davies is the conductor.
The ENO's London Coliseum underwent a four-year, Ô£41 million renovation between 2001 and 2004.