First of all, try to update the Project Profissional version with the build number of the new updated Project Profissional (Jan 2019) as mentioned below:
Try now, to open an updated Project Profissional and check if you can find the open and publish button or not.
Don't forget to connect to your Project Server account , not the local commputer.
If the issue still exists, so in this case, you may need to patch your Project Server with the latest update!
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