Weblogic Workshop 9.2: _pageflow directory is not generated

At some point our WebLogic's Portal web project in Workshop stopped generating the WEB-INF/classes/_pageflow directory and all files in that. There are no visible changes in the project structure, but because of that al开发者_如何学Gol the Beehive page flow portlets are not working anymore saying they cannot find files from that directory. Any ideas?

After a week of troubles we have found a workaround. Export ANT build script for given web project, execute its clean target, execute its build target and then it works again.