My NetTalk server app uses quite a few conditional compilation symbols, most of which are (mercifully) handled for me.
But from time to time, for no reason I can determine, all these symbols disappear. The entire set, including FM2=>1 which FileManager3 needs.
I was editing an embed, which I saved, and then I clicked “Start without Debugger (Builds solution)” and poof! All gone and the build failed because FM2=>1 was missing.
Am I doing something wrong? Is this a known bug in C11?