Can't Add Shifts

Hi, I just downloaded and installed the last version of this plug-in (3.0.9) on a WP v3.3+ and it didn’t let me add shifts, I’ve updated to the last version of WP (4.3.1) and still doesn’t work properly. The only way I can add a shift is by using right click on the “add shift” button and open it in a new window. Same thing happens with “Select Location”, most of these options are not working on the main window, it just loads a blank box. Can somebody please help me? Thanks

https://wordpress.org/plugins/shiftcontroller/