If in the unlikely event that Availability does not show correctly, then please try the following steps:
-Press the Ctrl& F5 buttons together, (CMD R for MAC) this will force a refresh from the servers and will most likely solve the issue.
-Change the month to a later month and the change it back.
-Navigate away from the Availability tab, and then come back to it.
-If you save the Availability without actually making any changes, then this can cause the Save button (when pressed) to look like it is loading but it will just hang. To clear this please press the “ctrl and F5” buttons together (CMD R for MAC).