This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
When adding support for new languages it currently doesn't seem possible to enable support for TODO scanning for the new file types.
It appears the "project scanning" of one project blocks the navigation in another project even if the first project is closed so only one project is now open.
fix: http://hg.netbeans.org/core-main/rev/6bce001495c4 user can manages supported file extensions and MIME types of TODO scanner via Tools/Option/Miscellaneous/Action Items