Yeah, I have had a similar issue. My browser (Firefox 2.0.0.12) would prompt me to open with/save as index.php or another php file. WordPress became completely inaccessible to me via both Firefox & IE. I had to remove the stats plug-in folder in order to login again. Had no problems before installing the plugin, and none since removing it. Too bad though, it could have been a very handy stats tracker…