stuck in question loop (Is b positive or negative?)



wxMaxima 0.8.2 http://wxmaxima.sourceforge.net
Maxima 5.18.1 http://maxima.sourceforge.net
Using Lisp GNU Common Lisp (GCL) GCL 2.6.8 (aka GCL)

a:y=b^x;

plot2d(a,[x,-5,5]);

To which it asks: 
> Is  b  positive or negative?

Can't get past that point.  Have tried typing p, pos, positive.
No matter how I reply, it does not take the answer, it just
repeats the question.

> Is  b  positive or negative?

Same result in a console window (using Maxima 5.18.1)

Is this a bug?

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