NEW YORK (AP) — Adobe's Creative Cloud software subscription service has been inaccessible for the past day for the 1.8 million designers, Web developers and other creative professionals who pay to use it.

The outage is a black eye for Adobe Systems Inc., which shifted to the online subscription model for distributing its software a year ago. Creative Cloud makes Adobe's software products available through a monthly subscription that starts at $50 for an individual if they sign up for at least a year.

The maker of Photoshop, Illustrated and Acrobat says the outage is preventing users from logging in to its site with their Adobe IDs. Adobe says it is sorry for the delay and it is working to restore the service, although it has not said how long this would take.