Index: openacs-4/packages/forums/lib/message/thread-chunk.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/forums/lib/message/thread-chunk.tcl,v
diff -u -r1.15 -r1.15.2.1
--- openacs-4/packages/forums/lib/message/thread-chunk.tcl	15 Jun 2018 19:59:03 -0000	1.15
+++ openacs-4/packages/forums/lib/message/thread-chunk.tcl	19 Jun 2019 15:59:27 -0000	1.15.2.1
@@ -21,7 +21,7 @@
 set forum_id $message(forum_id)
 set tree_sortkey $message(tree_sortkey)
 
-if {[forum::attachments_enabled_p]} {
+if {[forum::attachments_enabled_p -forum_id $forum_id]} {
     set query select_message_responses_attachments
 } else {
     set query select_message_responses
Index: openacs-4/packages/forums/tcl/forums-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/forums/tcl/forums-procs.tcl,v
diff -u -r1.38 -r1.38.2.1
--- openacs-4/packages/forums/tcl/forums-procs.tcl	21 Dec 2018 14:53:27 -0000	1.38
+++ openacs-4/packages/forums/tcl/forums-procs.tcl	19 Jun 2019 15:59:27 -0000	1.38.2.1
@@ -92,7 +92,17 @@
         -forum_id $forum_id
 }
 
-ad_proc -public forum::attachments_enabled_p {} {
+ad_proc -public forum::attachments_enabled_p {
+    {-forum_id ""}
+} {
+    Check if attachments are enabled in forums.
+
+    If 'forum_id' is not passed, check only if the attachments package is
+    mounted as a child of the current forums package instance.
+
+    Otherwise, check also if a particular forum's 'attachments_allowed_p' option
+    is true. In case the package is mounted and the option enabled, return 1.
+
     @return 1 if the attachments are enabled in the forums, 0 otherwise.
 } {
     if {"forums" eq [ad_conn package_key]} {
@@ -101,6 +111,13 @@
     } else {
         set return_value 0
     }
+
+    if {$return_value && $forum_id ne ""} {
+        forum::get -forum_id $forum_id -array forum
+        if {! $forum(attachments_allowed_p)} {
+            set return_value 0
+        }
+    }
     return $return_value
 }
 
Index: openacs-4/packages/forums/www/message-post.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/forums/www/message-post.tcl,v
diff -u -r1.48 -r1.48.2.1
--- openacs-4/packages/forums/www/message-post.tcl	7 Jun 2018 18:08:11 -0000	1.48
+++ openacs-4/packages/forums/www/message-post.tcl	19 Jun 2019 15:59:27 -0000	1.48.2.1
@@ -75,9 +75,11 @@
                                && ($parent_id eq ""
                                    || [forum::security::can_post_forum_p \
                                            -forum_id $parent_message(forum_id) -user_id 0])}]
+if {$forum_id eq ""} {
+    set forum_id $parent_message(forum_id)
+}
+set attachments_enabled_p [forum::attachments_enabled_p -forum_id $forum_id]
 
-set attachments_enabled_p [forum::attachments_enabled_p]
-
 ##############################
 # Template variables
 #