Missing models or purple textures
Confirm the player accepted the latest resource pack. With Nexo, inspect generation and upload logs. Without Nexo, rebuild and upload the combined pack before marking the client ready.
A product does not appear
Check that its untouched .rfxpack is directly in plugins/RuneFX/packs. Read Installed Products and the first activation error in the server log. Modified, unsigned or incompatible archives are rejected.
Effects disappear under load or at distance
Model particles share a safety budget. Check runtime.max-model-particles before increasing it. For distant effects, check runtime.render-distance, loaded chunks, server view distance and the player's Entity Distance setting. Test performance before raising limits.
Silent sounds
Stand inside Audible Range. Check the client's relevant non-musical sound category, resource pack and runtime.max-sound-voices-per-player limit.
Requesting help
Include exact server, Java, ModelEngine and RuneFX versions, the product version, the first relevant error and reproduction steps. Remove passwords, tokens, private URLs and personal information from logs before sharing.