BracketHighlighter purposely stops trying to find brackets after a certain threshold. The threshold is in the settings file. This is to ensure performances remains tolerable while you are typing and moving your cursor around. You can increase the threshold if you like. I also provide a command in brackethighlighter to do a on-demand search that will not use the threshold and search to the end of the file. There are also commands to jump between the brackets that also do not use the threshold. You can bind all of these commands to shortcuts if you like. I provide an example shortcut file to show you how.