[dcc32 Fatal Error] DUnitX.TestFramework.pas(871): F2084 Internal Error: G9413 It appears to be this bug http://qc.embarcadero.com/wc/qcmain.aspx?d=111979 I tried the work around, and it compiles, however then the TDUnitX class constructor does not get called. The compiler bug was fixed in XE4.