A bug in the isomorphism test for planes which caused it to hang at times has been fixed.

A bug in choosing base points for a degree 1 matrix group over a finite field has been fixed. Reported by Eamonn O'Brien.

A bug in the graphics code for PSL(2,ℤ) has been fixed. Reported by Philippe Elbaz-Vincent.

HorizontalJoin, VerticalJoin and DiagonalJoin for sequences and tuples of matrices has been greatly improved.

A serious inefficiency in DirectSum for a sequence of matrix rings has been removed as a consequence of the above change. Reported by Derek Holt.

A bug in the isomorphism test for linear codes which could have resulted in a crash has been fixed. Reported by J. G. Maks.

A molten bug that occurred in infinite extension function fields (eg. function fields arising from curves or rational function fields) when trying to compute the polynomial underlying a place has been fixed.

Maps between a cyclotomic field and its vector space over a subfield have been rewritten.

A bug in the intrinsic AbsoluteField caused certain examples not to terminate.