For those of you who experienced this issue last night, can you post here who your cable provider is? Without spilling the beans, this issue is getting the necessary attention and this information would be helpful in order to determine the root cause.
Dell XPS 420, quad-core, 4GB RAM, 1TB
Dual ATI CableCARD tuners
HDHomeRun
Pioneer Elite PRO-1150HD connected via Linksys DMA2100
Pioneer PDP-5080HD connected via Linksys DMA2100
Velocity Micro Windows Home Server, 1TB
mControl Home Automation