But the remaining members have insisted it’s full steam ahead.
The 21 founding companies in the Libra Association - down from 28 when the project was first announced - met for the first time in Geneva on Monday.
A spokesman told the BBC he believed the currency was still on track to launch next year.
But, he added, it would only do so if suitable regulatory approval had been granted.
It comes after a stern warning from the G7 group of nations that Libra risked disrupting the global financial order.