In 0.3.1, the effects aren't seeming to work. In my tests, I had an attack that set a negative value for the HP regen, but the effect was never applied (despite 100% chance of applying). I don't think the problem is in my XML, as I've tested said XMLs before, and even tried a copy-paste from the wiki. Seems to me that the effects simply won't apply to the units...
Also, relatedly, there is an extra line (which is blank, except for that odd bullet character that appears on the effect menu when you hover over the attack button). I have an image that details exactly what I mean, and will post it when I get home (sorry, school computers) along with the XML.
EDIT// Here's the image of what I am describing: