Nice software ! Works well with the newest Firefox and FlashGot extension.

However, when I tried to download a large number of files (~200) FDM behaved strangely: some downloads started automatically but the rest were shown as waiting (hourglass icon). According to docs this means that these downloads should start automatically (Autmatic Start was checked) but this didn't happen. Is this a known problem ? Any tips or tricks ?

Got sometimes the same - think that this is server based. Some servers allow only one download at the same time form the same ip.

Yes, server could limit the number of connections. However, I expected that in this case FDM would automatically start download of a pending file when one of active downloads finished. This didn't happen.