(Bloomberg) — Nvidia Corp. investors used to big announcements and equally large stock gains during the company’s week-long GTC conference were left wanting this go around. With few near-term catalysts and shares at a key technical level that often signals losses, market watchers are warning of more disappointment ahead.Most Read from BloombergNew York Subway Ditches MetroCard After 32 Years for Tap-And-GoLA Faces $1 Billion Budget Hole, Warns of Thousands of LayoffsDespite Cost-Cutting Moves,