This is usually caused by a differing sample rate between your computer audio settings and your project settings.
By default a Windows PC will use 44.1kHz as it's sample rate for audio cards as this is probably the most common sample rate for consumer audio. When opening a DAW project with a different sample rate, you will hear pops and clicks as the DACS reinitialise and clock to the new sample rate. These clicks are usually fairly low in level and aren't likely to damage your monitors, but where possible it is always best to minimise this.
Another effect of having different sample rates is that computer audio refuses to play, this means that anything trying to play audio other than the DAW will not work. YouTube videos, SoundCloud, iTunes, Media Player etc.
If you aren't interested in playing audio from other computer programs while you are working in your DAW then you don't really have to change anything, it will still work in the DAW as normal.
To fix these issues is fairly simple although can be a bit of a hassle to change if you need to do it every time you open your DAW so my advice is that if you use one particular sample rate more than others which is different from the default 44.1kHz then it would be worth changing the default sample rate to match the one you use with your DAW. For the occasional sample rate change this isn't a problem and only takes a few seconds to change.
To change computer sample rate:
- In the system tray there should be a small speaker icon, click on this.
- This should bring up a fader with and a little speaker image above, click on the speaker image. (This is a shortcut from going via the control Panel > Hardware+Sound > Sound > Manage Audio Devices > Audient > Properties)
- This brings up the current Speaker properties (which should be your iD22), navigate to the Advanced tab.
- In the Default Format drop down menu, select the sample rate you require.