I managed to "fix" the problem by simply flashing the crDroid ROM again although i'm now having big issues with the ROM itself.
For some reason my phone is being forced in to Silent mode even though I haven't set it to be in silent mode, please see this screenshot
Additionally, Youtube videos simply dont work properly, they are either pixelated and broken up or they play in what looks like 2fps or something.
If I reboot my phone I get sound and Youtube videos play normally but only for about 5 seconds or so and then my phone goes back to silent mode and Youtube videos are broken again.
If anyone has any advice i'd really appreciate it.