Today I installed a plugin (Yoast's SEO plugin) and it totally messed up my site - constant looping, redirecting in ways it shouldn't have been, etc - so I went to uninstall it... and couldn't. When I click plugins it prompts me to log in, and then when I do it sends me to my home page. If I click plugins again the same thing happens.
I backed up my wordpress site, deleted the install and the files through my cPanel file manager, reinstalled - and the problem still persists.
Anyone know a work around?