| Symptom | Likely Fix | |--------------------------------------|-------------------------------------------------| | No output after driver install | Set PCIe Relaxed Ordering = Disabled in BIOS | | Audio drift after 30 min | Check genlock source – force external reference| | Corrupt frames on channel 3 & 4 | Reduce PCIe link speed to Gen2 in card tool | | API returns MBL4_ERR_BUSY constantly | Increase mbl4_max_queue_depth in registry |