Found a bug in testing on 10.1.0.5 with the 10.1.0.5 patch 3 applied on win32, standard edition, w2k server sp4.
The bug is fixed in 9.2.0.8 and 10.2.0.2.
See note 342197.1

This error (ora-7445 [qeestraverseexpr) did not occur on 10.1.0.4 with the 10.1.0.4 patch 13 applied.

Beware.

Paul