Frames are no good unless you really really need to use them for an application of some sort, there are much better methods now the frames. Bad for SEO too unless done right, just adds to the headache of webmasterdom I say.
Frames just bring a whole bunch of problems, from search engine results to usability by web users. If you absolutely need to use a frame, I would go with an IFRAME instead.
Yeah, I've noticed the same, especially when trying to copy and paste text within them, for instance. I wonder if this is strictly a browser bug or what...