Call the latest installment of the saga ''Indiana Jones and the Lost Window of Opportunity.'' Variety reports that team Indy -- Harrison Ford, Steven Spielberg, and George Lucas -- has slammed the brakes on the long-awaited fourth movie, which was to shoot this summer. The reason, sources close to the production tell Variety, is that producer Lucas is unhappy with the script, written by ''The Green Mile'''s Frank Darabont. Another writer will be brought in to revise, but in the meantime, Ford and director Spielberg may pursue other projects. (High on Spielberg's to-do list: ''The Rivals,'' about the feud between 19th-century stage divas Sarah Bernhardt and Eleonora Duse.) As a result, it may be a year before a 63-year-old Ford goes before the cameras and 2006 before the film reaches theaters, marking a 17-year hiatus since ''Indiana Jones and the Last Crusade.'' Spielberg declined Variety's request for a comment.