My apologies you are experiencing this issue.
CCAV has proved popular, so Comodo needs to upgrade it’s Valkyrie servers. We understand the upgraded swarm should be ready some time in the next few weeks.
Meanwhile you don’t need to do anything in particular. Don’t worry about security - because CCAV works by default deny, the pending files files will be sandboxed and unable to damage your system. If the fact that the a program is sandboxed is causing inconvenience and you know it is trustworthy you can release it from the sandbox by right clicking on it in the sandboxed applications list and restarting it.