What is "No DC"?

For some reason, upon starting up Umineko Project today, despite having had it for a very long time and playing it for a while, suddenly a phrase "no dc" has appeared in the corner of my game. What is happening?

This is an NVidia driver bug, see here, here, here, etc. Happened to quite a few people, apparently.

Oh, thank you! I ended up resetting Nvidia's settings and it works now ^^