I recently did a new install of Megan6 (v.6.4.15) and downloaded the current mapping file for protein-entries (prot_acctax-Nov2016.abin.zip). I unzipped the mapping file and started MEGAN6.
However when I try to load the mapping file within megan6 (either for importing from BLAST or for meganizing daa-files) nothing happens. I do not get an error message, but the mapping file does not seem to be loaded, regardless.
Normally when megan6 imports such a mapping file the "Use Accession" box should become ticked, which is not the case here. Also, ALL of my reads end up as "unassigned".
I then tried to use the command-line based "Blast2LCA" tool instead. This tool gave me an Java-exception, stating that the mapping file has a wrong "magic number":
java.io.IOException: File has wrong magic number
(Probably it was meant that this message should also appear in the GUI version of megan6?)
So I'm guessing the mapping files I downloaded are broken? However, I tried downloading several times, always with the same result.
Could you provide md5checksums for these mapping files, to double check if the problem is on my side?