First off I have an older 41 so that may be some of the issue. BUT trying to up date from 1.42.7, Safari was a no-go and Explorer didn't seem to work either (not sure why since I had used the browser update before?) so I did the TFTP thing and all was fine. Except many URL's wouldn't load, mail wouldn't connect etc. Tried to go to a version that folks seemed to think was more stable but the Linksys is one of the URL's that wouldn't connect. Found my old firmware. Downgrading was a breeze through the browser. Went to Linksys's FTP site to get some older supposedly working firmware versions (1.45.7 & 1.44.2z) Tried 1.45.7 - same problems as the latest version. Tried 1.44.2z and that seems to be working.
I only went on this adventure because I was having to reset the router every couple of weeks or so when it would "get lost" and not connect.
I get the feeling that this is more of an issue with OS X (so probably Unix also) than it is with Windows, though that seems strange since they do a lot of Unix systems? Anyway the ONLY Mac issues I know of with Linksys is that in the early days you couldn't update the firmware with out Windows and there tech help doesn't know jack about Macs, but you should be used to that by now - most ISP's don't know much either etc, etc ,etc.
Hey but they upgraded the firmware (the one that I was using) to do PPoE just in time to save my bacon (ISP changed service) so I give them points.