I have 3 blogs installed on 1 database. Today 1 of the 3 is not allowing me to add new plugins. If I go to Add New, Start Page, Featured, Popular, Newest or Recently Updated, I receive a message saying "An Unknown Error has occurred."
Yesterday it was working fine. I installed and used a new plugin (Neugs). This plugin was also installed on both of my other blogs, and they are still working properly. The only other change I made on the blog that is malfunctioning, was to add a line of code to display Tags on single post pages, on the Single Posts php for the layout.
Everything else on the blog seems to be working. Any ideas on the cause of, and fix for this problem?