The bad image error is something you can ignore. It has been around since 2009. Futuretech explains it briefly here:
Windows will notice there is no hash provided as it would like see. It is not a security issue nor does it effect functioning. But it is sloppy Comodo does not fix this. This error has no relation with the issue you are facing.
The problem with the tray icon not always showing is a visual bug and a known issue that is being looked into. The not showing of the tray icon has no bearing on the function of CIS; it’s very much a sore to the eye to many of us but nothing more than that.
Both issues you found are red herrings to your problem. So we have to start from other angles to try to find what is causing this.
First thing that comes to mind is to install the latest stable version 8012 and see if that makes a difference. It can be downloaded from the release topic.
Do you have other security program installed side by side with CIS? That sometimes causes issues. Or did you have other security program installed in the past? In that case make sure to run a clean up tool from that vendor to make sure all traces are removed. Sometimes a left behind driver or service may cause instability. Eset has a list on their support pages with clean up tools of various vendors: [KB146] Uninstallers (removal tools) for common Windows antivirus software .