Each answer names the cause; the link leads to the page that owns the detail.

• Why is Cargo Sites empty? It lists destinations for the cargo you are carrying, so with an empty hold it shows (no loaded cargo). See Radio Menu and Deliver Cargo.
• Why did my crate not deliver? The destination has to accept that cargo, and your aircraft has to be at its delivery point while you unload. See Deliver Cargo.
• Why was my crate refused at an airfield? An airfield's storage is shared by every cargo, and a full store refuses further deliveries. The crate stays on the ground. See Airfields.
• Can the C-130 deliver to a Hub? No. Airplanes cannot land on a helipad, so the C-130 unloads into an airfield's storage and a helicopter flies the last leg. See Aircraft and Airfields.
• Why is a Source empty or blocked? A Source produces on a cycle and pauses while its own warehouse is full. See Sources.
• Why can I not start a Project? A Project needs a free build site, the required site level and its cargo in the local Reserve. See Build a Project and Projects.
• Where do I see current rumors? Type -tyc rumors in DCS chat, or switch on the RADAR layer on the Live Map. See Rumors.
• Why can I not hear the A/N signal? SRS must be connected and tuned to the rumor's exact frequency and modulation, and the aircraft must be inside the signal's range. See Map a Rumor and A/N Direction Finding.
• Why is a Settlement not recovering? Trust only climbs while that Settlement's own Food store is high, and only while somebody is flying. See Recover a Settlement and Trust.
• Does the world consume supply while nobody is online? No. Settlement Food consumption and Trust changes pause while nobody is flying an airplane or helicopter. Sources and factories continue running; see Settlements and Trust.
• Does progress survive a restart? Yes for the world: sites, stock, Projects and statistics persist. Crates left lying on the ground do not last. See Restarts.