Unfortunately I had to cancel the show, 10 Minutes before the start, and it was the second show of my bosses production

Everything worked well, setting up the hardware and projectors, behaved like expected and we were finished and ready to go when suddenly one of the projectors missed the signal. I tried to fix it in the Advanced Screen Settings but I couldn't´t handle it, so I wanted to restart Resolume. But that wasn´t working anymore.
I had no chance to open my project again. The setup was made in Version 5.1.1. Then I installed 5.1.2 and I tried older versions down til 5.0.4 but it was the same everywhere.
Because I still had some time left I reinstalled Resolume, updated Blackmagic Drivers, Graphics drivers, but still I wasn´t abled to open my project.
When I temporarily renamed the screensetup.dll Resolume started but (for sure) I wasn´t able to put something out.
The Setup is kind of complex with 7 720p Outputs (3 Over Decklink Quad SDI) and 1 Camera Input. But it worked flawlessly during the 4 Week rehearsal process (on some days 12 hours a day.)
Today is reserved for fixing, so if anyone of you has got an idea what could help I´d really appreciate it.
If I´ve found a solution I´ll let you know.
Greetings
Mario