Index: app/controllers/repositories_controller.rb
===================================================================
--- app/controllers/repositories_controller.rb	(revision 15582)
+++ app/controllers/repositories_controller.rb	(working copy)
@@ -114,6 +114,11 @@
     @repository.fetch_changesets if @project.active? && Setting.autofetch_changesets? && @path.empty?
 
     @entries = @repository.entries(@path, @rev)
+    if @entries.nil? && @rev.nil?
+      @rev = @repository.latest_changeset.revision
+      logger.debug("show: Entries at HEAD revision not found, trying with last known revision #{@rev}")
+      @entries = @repository.entries(@path, @rev)
+    end
     @changeset = @repository.find_changeset_by_name(@rev)
     if request.xhr?
       @entries ? render(:partial => 'dir_list_content') : render(:nothing => true)
@@ -130,6 +135,11 @@
 
   def changes
     @entry = @repository.entry(@path, @rev)
+    if @entry.nil? && @rev.nil?
+      @rev = @repository.latest_changeset.revision
+      logger.debug("changes: Entry at HEAD revision not found, trying with last known revision #{@rev}")
+      @entry = @repository.entry(@path, @rev)
+    end
     (show_error_not_found; return) unless @entry
     @changesets = @repository.latest_changesets(@path, @rev, Setting.repository_log_display_limit.to_i)
     @properties = @repository.properties(@path, @rev)
@@ -163,6 +173,11 @@
 
   def entry_and_raw(is_raw)
     @entry = @repository.entry(@path, @rev)
+    if @entry.nil? && @rev.nil?
+      @rev = @repository.latest_changeset.revision
+      logger.debug("entry_and_raw(#{is_raw}): Entry at HEAD revision not found, trying with last known revision #{@rev}")
+      @entry = @repository.entry(@path, @rev)
+    end
     (show_error_not_found; return) unless @entry
 
     # If the entry is a dir, show the browser
@@ -207,6 +222,11 @@
 
   def annotate
     @entry = @repository.entry(@path, @rev)
+    if @entry.nil? && @rev.nil?
+      @rev = @repository.latest_changeset.revision
+      logger.debug("annotate: Entry at HEAD revision not found, trying with last known revision #{@rev}")
+      @entry = @repository.entry(@path, @rev)
+    end
     (show_error_not_found; return) unless @entry
 
     @annotate = @repository.scm.annotate(@path, @rev)
Index: lib/redmine/scm/adapters/subversion_adapter.rb
===================================================================
--- lib/redmine/scm/adapters/subversion_adapter.rb	(revision 15582)
+++ lib/redmine/scm/adapters/subversion_adapter.rb	(working copy)
@@ -154,7 +154,7 @@
           cmd << credentials_string
           cmd << " --verbose " if  options[:with_paths]
           cmd << " --limit #{options[:limit].to_i}" if options[:limit]
-          cmd << ' ' + target(path)
+          cmd << " #{target(path)}@#{identifier_from}"
           shellout(cmd) do |io|
             output = io.read.force_encoding('UTF-8')
             begin