Ever since I first got my Cosmo, I frequently see broken app icons in Planet's App Bar. I believe this happens when an app is updated (by the Google Play Store).
I noticed that I could refresh the icons by killing and restarting the App Bar app. I put together a Tasker task that does this, so I could have an icon on my home screen which quickly resolves this for me. Many months later, Planet still haven't fixed the issue, so I thought I should probably share my workaround here.
To install it on your Cosmo:
Install
Tasker, then
click here from your Cosmo to easily install the task. Accept adding the task, then (importantly) press Back a couple of times to properly exit out of Tasker. Then add Tasker's Task Shortcut widget to your home screen (however you do that on whichever launcher app you're using - probably by long-pressing on an empty space), and select the 'Restart app bar' task.
Here's how it looks on mine:
