dillydallydot

Hi I'm desperate, I have done the usual and uploaded all the upgrade files and event though I've done it several times to make sure that it is right but all I get is Down for Maintenance (Err 2) An upgrade is currently in progress... Please come back soon... This has been since Friday. Can anyone please tell me what could be wrong ... without having to change all sorts of files and stuff ... surely if it was working before it should be working again?! Thanks for anyone's input. PS using latest version of joomla and php 5.5