Hehe, don't starting asking urgent help already, you don't even rely on it yet. Community won't like it.
This kind of issue was reported many times on Windows with Eta Carinae, you might find similar posts on SourceForge Help forum. I can't remember if a solution was found. I remember this happened to me when I was on Windows...I basically lost my work
Backup often (NOT with the TW backup which is not working) when you reget it working/create a new one.
For urgent help come one #tikiwiki. This post is not in the appropriated forum even if urgent. People here are building free software, not giving support