Hi,
Sorry for the issues I can help troubleshoot this with you.
I have not seen any other reports of this, so not sure what is causing this on your install yet.
You mentioned you disabled other plugins and it still did it, but could you please follow our testing for conflicts guide:
Testing Conflicts With Themes and Other Plugins
And see if that can narrow down the cause of this for at least any coding in WordPress.
Also, do you have any coding in your htaccess file besides the standard coding for permalinks?
Let me know and we can go from here.
Thanks