Safe strap 3.11 works with jellybean. Are you sure you are still rooted? Download root checker from play and run it to make sure. I also used ota rootkepper to retain root but it did not work for me personally.
Also, have you tried uninstalling safestrap and reinstalling the app before running it? I didn't have to on mine, but it may help you. Also, there's a quirk floating around where some people end up with root only semi-installed. It will claim that it's installed but won't actually work. There's a workaround for getting it back, but you'll have to look for it since I don't recall where it was that I saw it.
I had the same thing happen to mine and was able to get it rooted. You just need root (#) through adb shell and you will be fine. Read this thread, I followed [Q] Lost Root After Jelly Bean OTA Update - xda-developers, there are instructions on page 2, but I had to go a little further to get mine fully working (My post #24 in the same thread). You may want to try this rather than wait for an exploit because it could be a while or not happen at all from what I have been reading.