I am using 2.0 and unable to login or reset my password from both my PC and Mac. I've tried deleting cookies and cache. Had the same issue last night but was able to delete my wp-content/cache file per some instructions I found on this site, but today that solution is not working either. Not sure why this continues to happen. Is it an issue with the way my internet settings are set or is this an issue with WordPress? Any help would be much appreciated!