It looks like you mis-understand the use of this forum.
This forum is for peer-to-peer support only. No-one (even moderators) are paid. Any help given is voluntary, and the forum is luckly to have keen members who try to help.
Please remember this and be courteous to other members.
Devilion Staff (CubeCart developers) do not regularly read or post in this forum.
If you have upgraded an existing store, you should have tested CC5 first. This is standard IT practice. As server admin, you will be aware of why this is important.
With an evaluation on a different site/subdomain, you then would have been able to evaluate it (for free), and determine if it meets your needs.
There are official ways to report bugs.
CC5 is a large project, dispute testing, bugs will exist. I don't know Devilions release cycle, but from seeing CC3 and CC4 development, I fully expect their current workload is to fix bugs asap.
If you have not reported your problems, then they probably won't be fixed!