Hi,
Both bugs are fixed for next release, they are also fixed in 1.4 beta2.
if you want to fix for your installation without update you can change line 473 of application/controllers/EventController.class.php (function getUserPreferences) for this one:
if (user_config_option('calendar view type', '') != $view_type)
And to fix the bug at calendar export, go to application/views/event/cal_export.php and change the script at the last line for this one:
<script type="text/javascript">
btn = Ext.get('<?php echo $genid ?>cal_export_submit1');
if (btn != null) btn.focus()
</script>