Resolved
Reported for: Toolset Access 2.7.3
Resolved in: Toolset Access 2.8
There is an issue that prevents custom role users from previewing drafts and pending posts even though they belong to a WPML Group with needed permissions.
Currently, there is no workaround for this issue.
Alternatively, you can downgrade to Access 2.6.2 while we work on the fix.