Cut shortcut (cmd+x) doesn't work if I use the left cmd key (cmd+c does work with left cmd key!)?
It may very well be that the Razer drivers are incompatable with OS 10.10 Yosemite.  According to Razer, it seems the latest driver only supports up to 10.7 Lion although the last modified date on the download site is 26 Mar 2015.

One fix may be to find and get the legacy drivers for your Razer device. However, it may be best just to contact Razer about the issue which may also lead to a solution.