Blank page after editing Page in Visual mode

After I edit a Page it repeatedly appears blank in the public site.

I have WP 3.0.4 and plug-ins:

CSS Cache Buster 1.0
Media Tags 3.0.3
Regenerate Thumbnails 2.1.3
TinyMCE Advanced 3.2.7

The page I’m editing has 2 tables of images, which I am inserting and customizing with thickbox-enabled links. It was all working well for a while, but now that I’m on the second table, the blank page repeatedly occurs as I make further edits.

Here’s an interesting aspect of it:

If I edit the page in the Visual Editor and do an Update, I get the blank page.

But if I then go into the Revisions history, copy the HTML of that same (supposedly broken) page, and paste it into the HTML tab, then Update, the page works fine. <— THIS IS MY ONLY WORKAROUND AT THIS POINT.

If I then switch to the Visual tab, and Update again, the page goes blank.

—

I also notice on this page that I will do an Update, and then click to go to some other part of WP Admin, and it gives the “Are you sure you want to navigate away?” error, even though it should be up to date.