I am running 6.40B5.
When I open a folder of groups, then sort the list of articles by Subject, then scroll down quite a ways, and highlight a bunch of articles in the middle of the list or so, then right click and select either Create NZB from Posts or Save Files to Custom List, the resulting NZB or Custom List has a completely incorrect list of articles. This is after selecting "Download All Articles", (hopefully) overwriting my previous headers full of gaps and missing time frames.
If I do the same steps from an individual group instead of a folder of groups, it works as intended, placing only the highlighted articles in the Custom List and NZB.