Well, here's a juicy tidbit. Now that I've removed AdSense, my phone is no longer blanking out.
And, paid a visit to the only other site I've placed AdSense on (non-WP) - that site also does not display: loads, then *poof* blank white.
So, my phone (at least) does not like AdSense. Funny, given it's Android OS.
1 down; 1 to go.
I'll have to wait now to hear back from our visitor with the blank screen who uses IE.
I was going to try the SCRIPT_DEBUG on my test WP installation, but the only thing I had to see whether that helps was my phone. Since AdSense took care of its issue, I no longer care about that.
Resetting IE didn't help thepioneerwoman.com on my computer. Since I haven't had any issues w/ IE for my own site, that doesn't exactly matter much anyway.
Well, thanks for all the prodding and prompting on things to check, WPyogi! I'll let you know if I hear back from our user.