QUIET trading is becoming a massive headache for officials and traders at the Shenzhen market, where B-share index edged up marginally yesterday as lacklustre performances continued. Bloomberg reported that only eight stocks were traded in a day which was also marred by a computer malfunction in the morning. The Credit Lyonnais B-share index edged up 0.06 per cent, just 0.6 of one point, to close at 1,078.08. The A-share index was down 25.29 points, or 2.06 per cent, at 1,200. Trading yesterday was dominated by a $14.5 million cross in China Bicycle shares. The best performed stock was Chiwan Wharf which rose three per cent. However, big investors and funds continued to ignore the market, preferring to invest into China markets through Shanghai and Hong Hong. Traders suggest that there is little hope of a major turnaround in the market until some larger, industry-based stocks are listed there. ''It is just too shallow at the moment,'' one trader said. ''The listed stocks, with a couple of exceptions, are speculative by nature and have no real substance for long-term investment.''