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JOHANNESBURG, April 23 (Reuters) - A technical glitch delayed the start of trade on the Johannesburg Stock Exchange

JSEJ.J for an hour on Wednesday, the latest in a string of errors that have hampered Africa's biggest bourse in recent years.

Trade on the $900 billion exchange did not start until 0800 GMT, rather than the usual opening time of 0700 GMT. Investors shrugged off the delay, however, with benchmark Top-40 index

.JTOPI hitting another record high soon after the open.

The JSE said in a statement it had experienced a "technical issue," without giving further details.

The bourse moved its main trading system to Johannesburg from London in 2012 to increase trading speeds and in a bid to prevent the network errors that have disrupted trade in recent years.

Since then, the JSE has used the Millennium Exchange trading platform, which is developed by a unit of the London Stock Exchange Group LSE.L .

The JSE said in 2012 the move to the Millennium platform would "eliminate" its stability problems, which it said had hurt its reputation.

In 2011 trade was halted for more than 30 minutes due to network problems. A similar issue stopped trade for more than six hours in 2010.

The glitches have been an embarrassment for the JSE, which is looking to court more overseas investors and market itself as a gateway to Africa's growing capital markets.

(Reporting by David Dolan; Editing by Stella Mapenzauswa and Louise Heavens)

((david.dolan@thomsonreuters.com)(+27 11 775 3150)(Reuters Messaging: david.dolan@thomsonreuters.com@reuters.net))

Keywords: SAFRICA BOURSE/