Without any info about your project, your system, preview settings and so on we can't tell you anything. The original post may simply have been a bug where an excessive number of layers causes them to disappear. After all, 370+ layers in a single comp without any structure by ways of pre-compositions is pretty insane. The post probably simply got overlooked in the bustle of the forum, so that's why there#s no answers/ replies. Anyway, you need to be more specific and provide the necessary details before anyone can figure out what's going on.