latest 2015-01-08 Linux nightly .bz2 file will not decompress

I have been using the nightly linux builds for a long time, but latest 2015-01-08 and 2015-01-07 x86-64 nightlies will not decompress, with following error output on my arch linux system:

tar -xvjf mscore.64bits-2015-01-08-10-45-68600ec.tar.bz2
mscore

bzip2: Compressed file ends unexpectedly;
perhaps it is corrupted? *Possible* reason follows.
bzip2: Inappropriate ioctl for device
Input file = (stdin), output file = (stdout)

It is possible that the compressed file(s) have become corrupted.
You can use the -tvv option to test integrity of such files.

You can use the `bzip2recover' program to attempt to recover
data from undamaged sections of corrupted files.

tar: Unexpected EOF in archive
tar: Unexpected EOF in archive
tar: Error is not recoverable: exiting now

Sorry if this is wrong location to post. Last one I had downloaded 2014-12-31 decompresses just fine now, so I suspect there is some error in the build system, but I don't know how to look into this...

I do appreciate the reliable linux nightly builds, thanks!