I both installed a fresh instance as well as upgraded an older system to 7.6.4.
Now the Report links lead only to the module page they are pointing because they are missing the id of the record.
The following is a link to an Account in both new instances
index.php?module=Accounts&action=DetailView&record=
While the following is the same link before the upgrade:
index.php?module=Accounts&action=DetailView&record=8d8a3f55-7c59-c1e8-b85b-56161146771c
The “record” value is missing.