Wholly, if you see the date of my first post and check it with what was posted on DH's blog, you'll see that it predates DH's explanation by about a day or so. And yes, I checked the blog, checked the forums, went to the online chat, and reported the issue to DH before posting here
Fortunately, DH's amazing team quickly fixed the issue by compiling the appropriate version for the Zend Optimizer (in record time, from my point of view), and it's now running smoothly.
I'm just a virtual girl in a virtual world...
Take a look at my blog on virtual worlds