Thanks @rogierlankhors. Mine is not a WP multisite installation, but simply 2 Complianz installations, in the root and subdirectory.
With regards to my above stagtement
I solved it by implementing the hook force-empty-cookie-path.php via a mu_plugin…
sorry, thought I had fixed it, but what happend was that I had not reproduced the problem correctly.
Now I have realized that it still fails. Basically, once you set the sub-domain cookies it forces the root site to set the cookies again, and from then on the banner ALWAYS repeats on the sub-domains site. If set first the root cookies and then the sub’s ones, but dont’t refresh the root cookies, the the sub’s banner works correctly
This is no WP multisite intallation, but even though I tested the today’d releases of Complianz 5.2.0 and 5.2.1, but none solved the problem.
Has anybody a similar setup, but fixed it?