less-456 has been released for beta testing. less-453 introduced a incompatibility with previous versions of less, in that an option string would end at a space, dash or dollar sign, while traditionally an option string would end only at a dollar sign. less-456 restores the behavior that an option string only ends at a dollar sign.
You can download it from http://www.greenwoodsoftware.com/less/download.html If you find any bugs or have any comments, please send email to bug-l...@gnu.org. --Mark