So with update to build 211 your problem has disappeared, has not?

avast! stores settings of screen saver task in data/avast4.mdb or data/avast4.xml file (which one is used on your system depends on your INI file settings, see Database key of your data/avast4.ini).

If you are using XML storage you can view settings of avast! tasks simply with any text editor - avast4.xml is a text file. Look for tag in it.

To view content of avast4.mdb you must use MS Access or another database client that can connect to that file using some standard way (ODBC, OLE DB, …). There is table called Properties and there should be record with RealScreenSaver name in it. It holds name of screen saver.