Hello,
I did not use Newsbin for a long time, yesterday I downloaded last stable version (6.34) (from a clean windows install) launched a big *.nzb. It downloaded correctly but when finishing it gave errors about renaming files. So I closed Newsbin and saw most files were still named with _yEnc.nb2 (even if completed), I didn't touch anything relaunched Newsbin and noticed it was redownloading all over again (the first 5 files was already overwritten) so I shut it off, moved files to protect them and downloaded again the first 5 and finally renamed myself files and repaired using quickpar.
Today I tried latest beta 6.40B7, launched a new big Nzb, it gave me a message it couldn't load it so I renamed the nzb (name was quite long) and it loaded fine but I'm not sure it's not a random problem (btw I actually save the nzb on hdd not open it from temp folder from browser).
Later I had to shut off pc. So I closed Newsbin properly but it gave me a Windows crash message error about Newsbin (ok it's beta).
Re-opened it some hours later, I saw only par2 files were left in download list (but download was far from being finished) looked in tab "failed files" saw all the files (the ones downloaded and the others not) and the message "duplicate ..." I managed to put them back in download list and now it seems ok
the beta seems to works better for me, I have a high end pc on windows 7 64bits and 64 bits Newsbin.
Thanks