Index: openacs-4/packages/theme-selva/tcl/selva-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/theme-selva/tcl/selva-procs.tcl,v
diff -u -N -r1.21 -r1.22
--- openacs-4/packages/theme-selva/tcl/selva-procs.tcl	17 Jul 2018 13:32:18 -0000	1.21
+++ openacs-4/packages/theme-selva/tcl/selva-procs.tcl	26 Jul 2018 13:25:44 -0000	1.22
@@ -182,8 +182,13 @@
             # else on the site
             set link "[dotlrn::get_url]/"
 
-            if {[dotlrn::user_p -user_id $user_id] &&
-                [ad_get_client_property dotlrn home_tab_selected_p] } {
+            set selected_p [ad_get_client_property dotlrn home_tab_selected_p]
+
+            if { $selected_p eq "" } {
+                set selected_p false
+            }
+
+            if {[dotlrn::user_p -user_id $user_id] && $selected_p} {
                 # this user is a dotlrn user, we've selected the home tab,
                 # show their personal portal subnavbar, including the control panel link
                 set portal_id [dotlrn::get_portal_id -user_id $user_id]
Index: openacs-4/packages/theme-zen/tcl/navigation-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/theme-zen/tcl/navigation-procs.tcl,v
diff -u -N -r1.10 -r1.11
--- openacs-4/packages/theme-zen/tcl/navigation-procs.tcl	27 Jun 2018 16:11:45 -0000	1.10
+++ openacs-4/packages/theme-zen/tcl/navigation-procs.tcl	26 Jul 2018 13:25:44 -0000	1.11
@@ -200,8 +200,13 @@
             # else on the site
             set link "[dotlrn::get_url]/"
 
-            if {[dotlrn::user_p -user_id $user_id] &&
-                [ad_get_client_property dotlrn home_tab_selected_p] } {
+            set selected_p [ad_get_client_property dotlrn home_tab_selected_p]
+
+            if { $selected_p eq "" } {
+                set selected_p false
+            }
+
+            if {[dotlrn::user_p -user_id $user_id] && $selected_p} {
                 # this user is a dotlrn user, we've selected the home tab,
                 # show their personal portal subnavbar, including the control panel link
                 set portal_id [dotlrn::get_portal_id -user_id $user_id]