I am so angry. Someone says they know how to rep fast, but they are selling it. I'm so mad. I finally figured out how to rep on this terrible board, and I'm not going to sell it. I'm going to tell everyone what I do, and if that helps then good.
Here is what I do. Click on the icon twice, fast. This will open two windows. Paste whatever. Wait moment, then double click on the submit bar. This almost always works.
I hope this helps you, and I hope if other people know how to do something they will share it, and not sell it.
The double click on the rep icon opens two rep windows. You don't use them both, but for some reason it stabilizes the rep window more. You just use one of them. If the first doesn't work right, use the second. X out of any window that doesn't load all the way.
This does not use two reps. If you try to use the second window, it will tell you that you can't give reputation to the same post twice.
The only glitch I am still having is that you need to wait about four seconds after you paste before you hit the submit bar.
I used 20 of my reps this morning this way. I repped five people in two minutes. It's not super fast, but it's better than yesterday when I couldn't rep at all.
The fast double click on the submit bar "post quick reply" works for posting as well, most times (wait four seconds before you do this). I still am copying my posts, though, just in case.