Media reports on Thursday quoted an unnamed Burmese official as saying that the Wednesday move, where the government opened proceedings to diplomats and journalists, was "only for one day".
Myanmar's opposition leader Aung San Suu Kyi is accused of breaking the terms of her house arrest, after a US man swam across a lake to visit her.
The 63 year-old Nobel laureate has been in detention without being charged for more than 13 of the past 19 years with her latest period of house arrest due to expire on 27 May,
The current accusation against Suu Kyi is widely believed to be a pretext to foil plans for her participation in the next year's elections.
On Wednesday, Aung San was allowed to meet with three foreign diplomats and several others, along with 10 journalists, at Rangoon's Insein prison.
Meanwhile, Suu Kyi's lawyers have rejected the allegations against her, arguing that she did not invite the US national, John Yettaw, to visit, but only allowed him to stay because he pleaded exhaustion.
UK ambassador Mark Canning voiced concerns that she might not receive a fair trial, describing the case as "a story where the conclusion is already scripted."
Myanmar's ruling junta is scheduled to hold multi-party elections in 2010 amid fears of the same scenario as in 1990 elections where Aung San Suu Kyi's National League for Democracy clutched victory, but was never allowed to assume office.