Forgot to add the system report
### WordPress Installation ###
Site Name: Fusion
Home URL: http://www.test.dextrusdesigns.com.au
Site URL: http://www.test.dextrusdesigns.com.au
Version: 4.4.2
Locale: en_US
Timezone: UTC
Multisite: No
Permalinks: /%year%/%monthnum%/%day%/%postname%/
WP Memory Limit: 40 MB
WP Debug Mode: No
Script Debug: No
### Active Theme ###
Theme: Fusion – 1.0
Child Theme: No
Parent Theme: –
### Active Plugins ###
Simple Calendar: 3.0.13
Yendif Player: 2.3
Advanced Custom Fields: 4.4.5
Advanced Custom Fields: Repeater Field: 1.1.1
Advanced Custom Fields Pro: 5.3.3.1
Easy SMTP: 1.0
Nested Pages: 1.5.4
Contact Form 7: 4.3.1
Akismet: 3.1.7
### Server Environment ###
Web Server: Apache
PHP Version: 5.5.26
MySQL Version: 5.6.25-log
Server Timezone: UTC
Display Errors: Yes
Safe Mode: No
Memory Limit: 256M
Upload Max Filesize: 64M
Post Max Size: 65M
Max Execution Time: 30
Max Input Vars: 1000
fsockopen: Yes
cURL: Yes
SOAP: Yes
SUHOSIN: No
WP Remote POST: Yes
WP Remote GET: Yes
### Client Information ###
IP Address: 64.90.48.144
Browser: Chrome 48.0.2564.103 (Windows)
I don’t see anything really that sticks out. Did you follow all of these steps exactly? http://docs.simplecalendar.io/google-api-key/
Another thing to try, but probably won’t help, is that the shortcode has been updated from [gcal] to [calendar]. May be worth a shot.
Let me know.