Now, I know this is just for feedback. But I would like to know weather this is a bug, or an error on my side.

your side (i had same problem when IE was not fully loading try doing a full refresh or reuploading ya acp files
Refreshed worked for me after about 3 times

Had that exact thing (firefox) when upgrading to RC 2. I think I just reuploaded the files & everything was fine.

Nah, just do a hard refresh as it was mentioned above.