If it is a Steam glitch, as I think you are saying, then we won't be looking into it further.
FYI we don't have other such reports so it's very likely a Steam installation issue on your machine. A clean Steam reinstall (delete everything in the Steam folder except steam.exe and the /SteamApps/ folder) will probably fix it.
Venatorae said:
When you launch the game without Steam it indicates with an error message that some code hooks into steamworks - If after the troubleshooting I have done above you believe it is a bug with the EU4 <-> steam hooks as I do, can you please move the thread to the appropriate forum category. If QA is interested in identifying the issue, if any, please let them know to reach out to me.
This is WaD for EU4, it's not a bug.