Well, I turned on my camera today, using CHDK v.531 from Juciphox.
Got the version screen and then...nothing.
I guess that this is some sort of "death ware."
I installed this version shortly after it was available. I liked some of the mods.
Well, I pulled out my memory card and reset the memory "slide" to off.
Camera works as normal (is5).
For now, I'm not using any CHDK mods until this instability is fixed.
I hope that it is soon.