Purchases intray - unable to create new bill

Hi, 

Like others I too am experiencing problems with purchase intray documents. I am able to email and recieve invoices into the intray but when I select an invoice and click 'create new bill', nothing happens at all. When I refresh the page or close and re-open, the invoices are dissapearing altogether from the intray as if I have deleted them. It seems I cannot even double click an invoice or view enlarged invoice either - nothing happens. 

Please help asap as I am not sure which supplier invoices I have lost. 

Thank you