diff --git a/module/task/model.php b/module/task/model.php
index 90665662cf..2ae01c19ab 100644
--- a/module/task/model.php
+++ b/module/task/model.php
@@ -1033,7 +1033,7 @@ class taskModel extends model
         $estimate = $this->getEstimateById($estimateID);
         $task     = $this->getById($estimate->task);
         $this->dao->delete()->from(TABLE_TASKESTIMATE)->where('id')->eq($estimateID)->exec();
-        $lastEstimate = $this->dao->select('*')->from(TABLE_TASKESTIMATE)->where('task')->eq($estimate->task)->orderBy('date desc')->fetch();
+        $lastEstimate = $this->dao->select('*')->from(TABLE_TASKESTIMATE)->where('task')->eq($estimate->task)->orderBy('date desc,id desc')->fetch();
         $consumed  = $task->consumed - $estimate->consumed;
         $left      = $lastEstimate ? $lastEstimate->left : 0;
         $oldStatus = $task->status;
@@ -1386,7 +1386,7 @@ class taskModel extends model
         $action = strtolower($action);
 
         if($action == 'assignto') return $task->status != 'closed' and $task->status != 'cancel';
-        if($action == 'start')    return $task->status != 'doing'  and $task->status != 'closed' and $task->status != 'cancel' and $task->status != 'pause';
+        if($action == 'start')    return $task->status == 'wait';
         if($action == 'restart')  return $task->status == 'pause';
         if($action == 'finish')   return $task->status != 'done'   and $task->status != 'closed' and $task->status != 'cancel';
         if($action == 'close')    return $task->status == 'done'   or  $task->status == 'cancel';
diff --git a/module/task/view/start.html.php b/module/task/view/start.html.php
index f0ac64c756..960d1e6576 100644
--- a/module/task/view/start.html.php
+++ b/module/task/view/start.html.php
@@ -25,7 +25,7 @@
   <table class='table table-form'>
     <tr>
       <th class='w-80px'><?php echo $lang->task->realStarted;?></th>
-      <td class='w-p25-f'><div class='datepicker-wrapper datepicker-date'><?php echo html::input('realStarted', helper::today(), "class='form-control form-date'");?></div></td><td></td>
+      <td class='w-p25-f'><div class='datepicker-wrapper datepicker-date'><?php echo html::input('realStarted', $task->realStarted == '0000-00-00' ? helper::today() : $task->realStarted, "class='form-control form-date'");?></div></td><td></td>
     </tr>  
     <tr>
       <th><?php echo $lang->task->consumed;?></th>