This is now obsolete. 4.0.6 added an option to display the number on the original bar; it's found under the Status Text category of interface options.

Thus, there will be no further updates.

I know it's acting weird on Cho'gall and Atramedes now.

Apparently, the function I hooked into updtes every time anyone's bar changes, even though there's no information about whose bar is changed. Go figure.

A fix will have to wait until next week, I'm afraid. I recommend using version 1.0 until then. I might just add the coding for hiding the borders and background to that and release that as the updated version.

I can remove the border.

As for the original bar, it needs to remain shown. The reason is that this addon hooks into the function that updates the original bar, and uses the value to update the addon's display. In the tests I've done, that function doesn't run if the bar isn't visible. So unfortunately, the original bar needs to stay visible.

However, in this case 'visible' means that the game will consider it displayed. It doesn't necessarily have to be visible in a way that the player can see it - you are free to hide it off-screen or behind something else. I don't think I will build that into this addon, as there are several other addons that will allow you to move frames - I have even made one myself, called Movable.

On Cho'gall, I have experienced this myself, the bar reset to 0. This only happened once to me, when I was being mind controlled. It looked to me like the original bar disappeared, which is probably related. Either way, it returned to where it was supposed to be the next time I took damage that increased the bar. I'm going to try to fix this.

EDIT: Hiding borders (and background if you want to) works. The Cho'gall bug should also be fixed, although I won't be able to test that this week. I will also need to make sure that I didn't break the addon, which I will be able to do in tonight's raid.