I can't really reproduce it here, so I'll leave the status at New. Feel free to take a look at bugs.kde.org whether there is a similar report, otherwise try aggregating as many information as possible (when does it appear?, is there some pattern?, save the files which appear but shouldn't to post them later on in a bug report) and forward the report to KDE.
** Changed in: kdebase (Ubuntu) Status: Incomplete => New -- [kde 4] recently used items tab contains lock files which shouldn't be user-visible https://bugs.launchpad.net/bugs/253719 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs