If a user logs in or logs out a blank page comes up. How can I fix this? New users will be confused.
Look like a white screen of death as we call it in Wordpress.
A fatal error. Enable Wordpress debug to a log and check the log.
Please navigate to Dashboard > Forums > Tools > Debug Tab > Errors & Issues Sub Tab and check errors. If you see some Errors please let us know.
As you can see in error messages it says error comes from wp-file-upload plugin. Please disable that plugin, delete all caches and test it again. Then contact to that plugin support to fix this issue. You probably have other errors from other plugins, because the listed errors are result from other errors.
You can disable other plugins and check those enabling them one by one and find the problem maker. These errors doesn't come from wpForo. However they affect WordPress redirection function used by wpForo on logout process.