diff --git a/Dockerfile b/Dockerfile
index 4cc5c04c..6cf50964 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,7 +38,10 @@ RUN chown -R osem.root /osem/ && \
 # data directory is used to cache the secret key in a file
 ENV DATA_DIR /data
 RUN install -d -m 0770 -o osem -g root $DATA_DIR
-VOLUME ["$DATA_DIR"]
+# data persistence for uploaded files (logos, other pictures, etc)
+RUN mkdir 0775 -p /osem/tmp/cache /osem/tmp/uploads/ && \
+       chown -R  osem.osem /osem/tmp/
+VOLUME ["$DATA_DIR", "/osem/tmp/uploads/", "/osem/public/system/"]
 
 USER osem
 EXPOSE 9292
diff --git a/app/views/admin/cfps/index.html.haml b/app/views/admin/cfps/index.html.haml
index 09c208cf..1b80f411 100644
--- a/app/views/admin/cfps/index.html.haml
+++ b/app/views/admin/cfps/index.html.haml
@@ -7,7 +7,7 @@
 - if @program.cfps
   .row
     .col-md-12
-      %table.table.table-hover.datatable#tickets
+      %table.table.table-hover#tickets
         %thead
           %th Type
           %th Start Date
diff --git a/app/views/admin/conferences/_doughnut_chart.html.haml b/app/views/admin/conferences/_doughnut_chart.html.haml
index f4a8f0ba..6ad75cef 100644
--- a/app/views/admin/conferences/_doughnut_chart.html.haml
+++ b/app/views/admin/conferences/_doughnut_chart.html.haml
@@ -1,6 +1,6 @@
 .text-center
   %h4 #{title}
-  %canvas.doughnut_chart{ id: "dough_#{title}", 'data-chart' => data.to_json }
+  %canvas.doughnut_chart{ id: "dough_#{title.parameterize.underscore}", 'data-chart' => data.to_json }
 - if data
   - data.each do |key, value|
     %span{ 'style' => "border-bottom: 3px solid #{value['color']}" } #{key}: #{value['value']}
@@ -8,7 +8,7 @@
 :javascript
   $(document).ready( function(){
 
-   var d = $("#dough_#{title}");
+   var d = $("#dough_#{title.parameterize.underscore}");
    var dt = d.get(0).getContext('2d');
 
    $(window).resize( respondCanvas );