I have this issue and i cannot find the reason. Newly created pages come and goes on both the website and in edit-mode. My first thought was something was missing in the templates (like cache control), but than i discovered that the pages ware missing in edit-mode as well, which has nothing to do with the templates. I think it has something to do with output cache, but i'm not sure. This is a single server installation, it would make much more sense if it was a multiserver installation.... any ideas?
In the application pool, is "Maximum Worker Porcesses" set to 1?
Of course not :)I was almost certain i recreated the app-pool at some point but maybe not...
Does turning of output cache remove the problem?