I'got win7 pro 64bit and having big problems with RDA, application starts but the screen is blank.
I'v read and tried this:

..but it dosen't work.
I'v tried changing manually the .jnpl association, I'v tried a couple of programs to do that, I'v tried executing javaws in compatible mode...but NOTHING works.
I went drastic...unistalled all 64bit java, rebooted, installed ONLY 32bit java (v6.10),tested using opera 32bit (these 2 worked fine on my old xpsp2), but NOTHING changes...RDA screen is still blank...

And now I'm out of ideas...

Can you help?