Have you tried going into the Sins of a Solar Empire folder and running the Trinity/Diplomacy.exe directly? Also did you get the game in the store or via digital download?

Hmm, when you try to run it do you see a Sins of a Solar Empire Trinity/Diplomacy.exe in the process tab of task manager? Again when running the .exe directly? Does it go away on its own after it fails to run?

Also you may want try emailing support at sinssupport@stardock.com.

I have the same problem and nearly the same system. I've tried running the other exes directly, deleting the user.settings file (which another thread said might have been corrupted) and reinstalling. Starting the game creates a process, but no gui launches. The processes don't seem to go away on their own unless I force close them. If I start it with the version specific exes, I can have multiple processes running.

I can't find any error messages or system log events about this anywhere.

I emailed sinssupport. They first closed the ticket with no notification. When I noticed a week later and asked why they just sent a snarky response.  

So please post again if you've found something that works.

Thanks for the idea, harpo. The three exes were already in the firewall exception list. I also tried turning off the firewall completely. Same result.

Yes... No firewall and still same result. I also looked in the event viewer and there is no mention to anything trinity or Sins related.... I have no idea what to do next (

Did you ever get it to work ?

I am also having this exact same issue on a brand new PC. I can't find anything that could be causing it. Going to try a re-install sooner or later. Running Windows 7 64bit on a fresh system (just a few utilities, applications and other games installed thus far).

Did anyone ever have any luck sorting this out?