Hello Switch off the WordWrap mode (Ctrl+W) or disable highlight matching bracket in program settings or visit PSPad forum and download the latest build 4.5.8 from PSPad developer forum: http://www.pspad.com/open_develen.php Replace existing files with content of archive.
The bug is related to Windows 8.1 upgrade -- <http://forum.pspad.com/read.php?4,62345,62346> PSPad freeware editor http://www.pspad.com
