Hey Anne,
Have you had DAP => WP user sync enabled since you began accepting members?
You can check this by comparing your DAP user database in DAP => Users => Manage and your WordPress user database in WP Dashboard => Users.
If only *some* of your DAP members have corresponding WP user entries, that would potentially explain why some folks can log in while others can’t.
Another possibility is that you have a caching plugin (like W3 Total Cache or WP Super Cache) or a caching service (like CloudFlare) enabled, which interferes with logging and logging out properly, as was the case on my site until I excluded all DAP folders and system pages from being cached.
Also, you wrote:
Ideally, I would like ALL my logged-in users to have access to the forum without having to log in a second time on the forum page.
Is this even possible? Can you help? What information should I give you?
Yes this is definitely possible.
If DAP => WP Sync is enabled, the user flow should be:
==> The member logs in to DAP (not WP)
==> This automatically logs the member into WP as well
==> The member visits the forum and sees that he/she is logged in and can post
What might be happening in your case is that you members are trying to log in and log out using the Simple:Press login button, which would only log them out of WordPress but NOT out of DAP.
This was the case on my site as well, which is why I posted a support thread about removing the login button so that we could force members to login/logout through DAP *only*.
Finally, if you want users who log out of DAP to also be logged out of WordPress (which I reckon you do), you’ll need to implement the easy fix suggested by Veena on the DAP support forums:
http://www.digitalaccesspass.com/forums/threads/98-DAP-logout-not-logging-WP-%28Simple-Press%29-user-out
Hope that helps Anne!
Best,
Vic