In fact I generally do /msg the OP. If the problem is pre tags then I consider the node too. Often however it is that there is simply a long "unbreakable" string somewhere in the node. What happens with such strings depends on the browser and on your PM options.

Display Settings allows the PM rendering to be configured. However the soft hyphens that are used to provide wrap points are not handled correctly by all browsers. New code wrap options discusses the code wrap options and Re: Space or Soft Hyphens (see code wrap) provides a "test node" where you can check out the effects of the options you have set.