I was working on my blog/site - http://www.williswired.com/ - trying to make it even faster, and I have done something to cause problems, including ...
1. Blank screen when activating plugins as well as after deleting plugins (page loads when deactivating plugins, though).
2. "Author" image, using NextGen Gallery not loading in sidebar, while NextGen Gallery plugin in footer widget area works fine. (The same broken image icon for the Jetpack/Wordpress.com Stats icon in WordPress header bar doesn't appear either).
3. Weird characters showing up in my PageNavi plugin (with "Last") at bottom of page.
Those are the things I've noticed, so farHere's basically what I was doing ...
I wanted to test a different cache plugin. I deactivated WP Super Cache and installed/activated W3 Total Cache. I also tried Quick Cache. Unfortunately, I didn't read the uninstalling instructions, first, so maybe that messed things up? If so, I haven't been able to fix.
I did other stuff, too, but this seemed to be the thing that caused problems.
I've already tried some of the basic troubleshooting -- deactivating plugins, default theme. I also increased the memory limit in wp-config. I have deleted some plugins, including the cache plugins. None of that worked.
Any other ideas?