With "Enhanced" turned on, I successfuly entered the query, BirdTrack, giving a result of cardinality 3084, degree 4. Turning off Enhanced now worked fine and I saw the relation literal representation of the result. However, turning Enhanced back on now gave the exception shown below, in the window titled "DBrowser" (not the one I think of as the DBrowser window, which is titled "Rel - DBrowser"). This is with Version 0.3.8 but it happened yesterday too, with 0.3.7. It's a bit inconvenient when it first happens, because the window showing the exception is minimised and the Rel - DBrowser window just stops responding, making me think it's merely taking a long time to rebuild the tabular display!
Opening database: S:\Rel\V3\
Database S:\Rel\V3\ open.
Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap spa