Curious, we had a similar issue and I sent that project to Mordentral hoping he might spot whether it was an error on my part - or some bug, maybe your project suffered a similar fate as mine had?
I was on 4.11.2 when it happened to my project, so I decided to upgrade to 4.12.3 and in doing so made a new empty project and mine started working again as well.
I was on 4.11.2 when it happened to my project, so I decided to upgrade to 4.12.3 and in doing so made a new empty project and mine started working again as well.
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