The problems started with Windows 8.1. The problem is combination of highlight matching brackets + wordwrap mode If you switch off WordWrap mode (Ctrl+W), the problem disappeared.
I tested it with latest Windows 10 build and it doesn't happened to me. So for me it's hard to find a reason. The problem is joined with page drawing. -- <http://forum.pspad.com/read.php?4,65345,65348> PSPad freeware editor http://www.pspad.com
