A test was conducted here, in which a recording of last week's MFSK64 and MFSK128 images was decoded using the current release version of Fldigi (3.21.76) and the "Alpha" build used to produce VOA Radiogram.
The release version did not decode the MFSK64 and MFSK128 images correctly on this computer. They were not slanted, but the phase was off. The Alpha version 3.21.76AH decoded them perfectly.
I could not see any deal-killing issues with the Alpha, despite Norton's dire warnings that no one had used it yet and so they couldn't pass it without at least protesting a bit. It does not install over previous versions (Fldigi never does), and it does maintain your settings.
If you had this problem last week, the Alpha is available at the link given by Kim Elliott in the previous blog post.