Can you please post more details:
1. your server - php & mysql version, Linux or another os
2. Installed on hosting or on localhost
3. Installation method - softaculos, bitnami or manual installation?
Try one more time to be sure this is not file copy issue
1. debian 7, php 5.x, etc...
Actually, I find that the text file in your master_src v1.2.1 has problem. If I overwrite it with v1.2.0 and v.1.2.2 (just down from your server a few minutes before), there is no problem.
I also try to open your scripts with utf-8 editor and re-save it without BOM. Some errors are disappeared. But I have not finished to re-save all of your scripts.
Please make sure your development team use utf-8 text editor and don't save the file with BOM. (better in English environment)
For your reference, the v1.2.1 scripts are download from a weeks before and today separately. Please upload a clear v.1.2.1 to your server again.