A number of problems

The JFBCContent plugin has a bug right now that requires the JFBCSystem plugin to be enabled. Otherwise, it will throw that error. The Content plugin requires the JFBCSystem plugin for all of it's functionality, so it shouldn't be enabled on it's own anyways (or at least, if it is, it won't do anything)

Does the solution above, in this post , fix your issue? That is the solution I was referencing.

Basically, the template switching problem only occurs when the Social Profiles - JomSocial plugin is enabled. Disabling the JFBCSystem plugin will also fix the problem because that System plugin is what also loads the Social Profile plugins. So, you can test by doing the following:
* Enable the JFBCSystem
* Enable the JFBCContent
* Disable the Social Profiles - JomSocial plugin
At things point, the template assignments should work.
If you re-enable the Social Profiles - JomSocial plugin, template assignments will likely break. To fix, implement the minor code change in the jomsocial.php file and see if that fixes all of your issues.

I hope that helps explain, but please let me know if you still need assistance.

Thanks,
Alex

Glad to hear that fix worked for you. Again, a similar change will be in the 6.1 release, so you shouldn't run into that problem again.

Thanks,
Alex