Don't use hook_fullcalendar_options_submit when not appropriate

+++ b/includes/views/plugins/fullcalendar_plugin_style_fullcalendar.incundefined
@@ -87,10 +87,9 @@ class fullcalendar_plugin_style_fullcalendar extends views_plugin_style {
-    // If the options are from before the plugin system, update them.
+    // Move Colorbox settings into their own array.
     $options = $this->options;
-    if (!isset($options['fullcalendar'])) {
-      // Move Colorbox settings into their own array.
+    if (isset($options['colorbox']) && !is_array($options['colorbox'])) {
       $colorbox = array();

Can you explain this?

+++ b/includes/views/plugins/fullcalendar_plugin_style_fullcalendar.incundefined
@@ -99,10 +98,6 @@ class fullcalendar_plugin_style_fullcalendar extends views_plugin_style {
-
-      // Process the old values.
-      fullcalendar_include_api();
-      fullcalendar_process_options($options);
       $this->unpack_options($this->options, $options);

And this?

I didn't test it, but if colorbox still works and the options work than I don't see any problems.

Sounds good, didn't test it.