I tried a simple test application (with postgres as jdbc/Main, public schema and unquoted table and column names):
A "System" (with legacy navigation)
a "Simple Table"
repetitive "Database Record" (filled with the help of the "Import Structure from Database" wizard).
After starting the application (with embedded application server) and loading the page in the browser there is no table header or content displayed. Only the navigation frame and the table name (as view tab) are displayed.
Same after page reload.
But after clicking on the table name (view tab) results in "Busy..." and wristwatch.
Tested with empty db table and also with one record inserted.
For best results, use the Firefox browser..