I have the same problem.
I tried repairing and there was no change.
I tried deleting the c:\programdata\battle.net and blizzard entertainment folder and there was no change.
Edit: My game worked two days ago and I was able to complete a mission.
Edit again: My game now works because I changed the VirtuMVP - Destop Edition 2.1.111 to disable its sc2.exe entry.
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