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On another note, I tried it on another PC, and had the same kind of issue.  In fact it was similar to what was mentioned earlier, where it worked the first time, but then not a second.

When I first posted, I wasn't caching pages at all, but someone was saying the pages were loading extremely slowly.  I installed the page caching system to hopefully fix the long load times and maybe fix the problem.  It has not.

I have now added the forums as an exception to the caching scheme now, but it doesn't seem to have any impact.  The system still seems to refuse to display topics...

Ok, I dove down into the actual error logs on the server (instead of the webhost's not so useful "error log" cpanel feature)

There are lots and lots of these:

[03-Sep-2013 03:32:45 UTC] PHP Notice:  Trying to get property of non-object

And I saw this once:

[03-Sep-2013 01:53:24 UTC] PHP Fatal error:  Out of memory (allocated 40108032) (tried to allocate 30720 bytes) in /problem-with-post-edit-buttonome/kyusho5/public_html/wp-content/plugins/simple-press/forum/content/sp-forum-view-functions.php on line 1747
[03-Sep-2013 01:53:24 UTC] PHP Fatal error:  Out of memory (allocated 37748736) (tried to allocate 122880 bytes) in /problem-with-post-edit-buttonome/kyusho5/public_html/wp-content/plugins/simple-press/forum/content/classes/sp-topic-view-class.php on line 259

and this once:

02-Sep-2013 02:42:40 UTC] WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '
				post_count=0,
				post_id_held=0,
				post_count_held=0
				WHERE topic_id=' at line 2 for query UPDATE wp_sftopics SET
				post_id=,
				post_count=0,
				post_id_held=0,
				post_count_held=0
				WHERE topic_id=8443 made by require('wp-blog-header.php'), wp, WP->main, WP->parse_request, do_action_ref_array, call_user_func_array, sp_ahah_handler, include('/plugins/simple-press/admin/panel-toolbox/ahah/spa-ahah-toolbox-loader.php'), spa_save_housekeeping_data, sp_build_post_index, spdb_query

And twice:

[02-Sep-2013 01:31:54 UTC] PHP Notice:  Use of undefined constant trur - assumed 'trur'
[02-Sep-2013 01:31:54 UTC] PHP Notice:  Use of undefined constant trur - assumed 'trur'

I talked to my webhost provider (InMotionHosting) and they are quite convinced its a problem in the plugin.

My php memory limit is 256M at present.

The one post I test most regularly is: http://www.kyusho.com/kyushofo.....n-did-you/

But the pretty much any of the others I select in that first page of "English" posts don't load for me.  Only the first one regularly loads.

The only plugins I have that I would have thought would have caused any problems are:

s2members (disabling it didn't fix it)

Stop Spammer Registrations (disabling it didn't fix it)

I'm pretty sure that InMotionHosting runs mod_security... how can I tell?