CM 12.1 calling problem

First of all hello everyone..! :)

this might seem like a couple of noob questions, but the issues I am facing are real..

I installed the latest update of cm 12.1 yesterday "cm-12.1-20150911-UNOFFICIAL-ms013g-ver_AIO"..

I had been using "cm-12.1-20150614-UNOFFICIAL-ms013g-ver4_2" till yesterday

and overall, all the improvements in the latest ROM are fantastic..

Here I have 1 issue and 1 question:

ISSUE: right from my first boot, every time I get a call, and end it, it just doesn't hang up and the phone just shows the error: com.android.phone has stopped, and right after I click okay another error pops up: Dialer has stopped working

and then I neither can hang up the current call, nor I can make/take another call, the contact name of the first caller also gets stuck on the screen...until I restart the phone..and then it happens all over again..!

i.e.: A called me first, hanged up and the error appeared, now even if B calls me, the screen shows A calling, and I can't answer or reject the call..!

Can anyone please tell me how to get past that?

QUESTION:

in this ROM's june version that I was using, I was somehow able to change the call screen color to blue..
but since the update I installed yesterday, the call screen color has gone back to the Green shade..

can anyone tell me how to change it back to blue?