Dear, good Old Toad,
What would we all do without you? This is helpful to be sure, but my problems all seemed to start when I began using iWeb Switch Domain. Other odd things are happening, too. A couple of my album pages suddenly became invisible to me, although I could see all the photo pages associated with them. And everything published ok and could be seen online. Then suddenly I couldn't open any domain file at all with iWeb or IWeb Switch Domain.
Finally, I went back a ways on Time Machine and restored iWeb to my desktop, thinking that the application itself might have become corrupted, and used it to open one domain, and I've been laying low since then.
I did start painstakingly rebuilding one of the blank albums pages only to discover that the content of one of its photo pages had vanished. When I rebuilt it, the albums page magically reappeared.
I find all this very disturbing in light of the fact that MobileMe is going away (I already have a new web host, so that's not an issue.) and there will also be no support for iWeb in future. I'm worried that it will become unstable - has it already? - under some new OS version and I'll be SOL, along with a lot of other people.