He was sacked from the band, although no official explanation has been given, prior to the release of the global success of Once Upon a Time. Forbes has cited he wrote on 60% of the album, yet remained uncredited. Assuming he would quickly be asked to re-join the band, no legal action was taken. Forbes reunited with the band briefly during the recording of Néapolis and was again sacked from the band after touring for Néapolis, again no official explanation given. But Forbes was cited that he wasn't happy with the final mix of the album. Forbes and Mel Gaynor appeared at the Scotland Rocks for Kosova in 1999 performing Led Zeppelin's Kashmir, whilst Simple Minds also appeared on the bill with Mark Kerr on drums and Eddie Duffy on bass.
In 2009, Forbes was voted 'Scotland's Greatest Ever Bassist' by the readers of Dear Scotland, and his life and work is the subject of a biography in both print and film by writer/director Ethan Dettenmaier.
Forbes is now the bass player with Scottish band Big Country, replacing long standing Tony Butler who retired from the band.