All download tabs just stay grey without any error message. The tab Q Manager -> tab "Failed Items" -> column "Info" says "Error decoding /path/to/file: Not Enough Memory" whereby "/path/to/" stands for the the decoded posts directory and "file" stands for the newsgroup file.
With 2GB of RAM that seems highly unlikely.
Setting the decoder to "Use internal yy/uu decoder" doesn't change anything.
Fedora Core 6