You have to hit comma or enter key to add a tag.

As I said before AnsPress is not tested with multisite, and it may not work with multisite. But I would like to investigate the issue. Will you confirm that this error is not caused by other plugin, disable all plugin and then try.

You can use Ap Category position

For those who have tested multisite, did you have to change anything with permalinks or the URL structure? For example, ‘Ask’ takes me to “…/questions/ask/” on the main site, but on my other sites it takes me to “…/2015/09/29/hello-world/ask/”. Seems to be creating a new blog post or something along those lines. Any suggestions on how to fix this?

Yes you can set logo for every category.

You can edit login-signup.php in AnsPress theme.