Hello incantrix

2.78b will install over 2.78a since they are both 2.78 I am guessing that your settings may have been over written. I would not uninstall anything just re-install 2.78a run it and see if your settings and it runs as you expect it. If it runs normally then perhaps you got a corrupt install file for 2.78b and can try reinstalling it or run 2.78b from a zip file instead and see if it runs normally as you would expect it to run. I know when you are going from verision to another meaning like from 2.77 to 2.78 when the splash screen comes up there is an option to import your settings into the new build I do not recall if the same holds true for updates from one to the next on in the series meaning from 2.78a to 2.78b if you had any error messages that might have shown in the System Console Window might be able to determine where the error might be happening. to toggle System Console Window go to Window click on toggle System Console Window often we can see useful info there that can point to the issue

Hope this helps let us know what happens

Lobo3433

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Forum: Blender

Subject: 2.78b