Just wondering if this was anything important?

Is this just a bug or am I missing our on something?
Slush's pool seems to be working just fine, reporting that I am

Though 18914.218 is a little less than my "about 20gh/s" setup.

This is what the window looks like, notice its still accepting and but reading 0.00 GH/S

https://www.dropbox.com/s/8o8ozlakp7pybov/macminer.tiff