And you can download MyFile
Here is a better solution for iFile crashes after untether JB
1. Get a DropBox account -- if you have not have one.
2. When downloading a file using Safari, you'll be given 2 choices, DropBox (from step 1) or iFile. Then select iFile to open the file of your iFile. Once it's done, iFile will start working again. Try this fix, tell me if this works for you.
Thanks to DarkXShadowX21 who dropped me a comment on this issue.