Plugin page blank after deactivating and deleting plugin

I am running a multisite install and downloaded the Frontend Publishing plugin. I fooled with the plugin and had trouble getting it to work (displayed the short code, but not the actual editor it was supposed to), and then deactivated it and deleted it.

Now I cannot get to my plugins page in the dashboard. It is completely blank. I can still go to plugin management on the network page, and I can still go to the add new page, but when I add something, it doesn’t come up.

Also, when I click on one of those choices, it occasionally tells me that I have had too many login attempts and won’t let me log back in – even though I was already logged in when I get that message.

I went into my file manager through Lunarpages and renamed the plugin folder and then renamed it back to plugins, but it did not fix the problem. I also cannot find the specific plugins for me to try to work with them (delete or otherwise) through the file manager.

My site looks fine from the front end.