Also, an update on this...
If one goes CWP dashboard>Security>mod security
click on the domain for which the problem exists and under "Actions" turn off Mod_Security, the problem immediately goes away in Wordpress.
For the time being, until i can find the right set of whitelist rules i need for Comodo WAF...
i am leaving Mod Security turned off for the problematic domain with the problematic wordpress installation, and instead using Wordfence Firewall plugin inside Wordpress itself to control all Firewall and security functions (which is quite powerful and does the trick at the "work face"