I just checked. The problem seems to still persist.

However, when I tried using another PC to add the shifts, there were no issues and I was able to add the shifts.

It seems there is a problem with my PC.

Thank you for your help with solving the problem :).

I have provided a link for a video that showcases the problem:

http://www38.zippyshare.com/v/1phItpwf/file.html

Thanks,