I migrate to Mac OS X 10.6.6.

And Maple 13 and 12 (with or without Firewall)

do not work any more : "kernel connection is lost".

(When Firewall is working, it has all the necessary permissions.)

The mserver (64 bits) mobilize 100 % of CPU two or three times

(and I have to wait at least 1 minute each time), then disconnection appears.

I reinstalled Maple 13 and get the same results.

What can I do ?

I need to integrate an ODE : I use dsolve.

As there is not an exact solution, I use numeric integration :

F := y''(x) + a(x)*y'(x) + b(x)*y(x) ;

EDF := {F = 0, y(t0) = y0, y'(t0) = dy0};

Snum := dsolve(EDF, y(x), type = numeric);

S  := x --> rhs(Snum(x)[2]) ;

I can now plot the graph of the solution S.

But suppose I need also the graph of the derivative S'.
As this function is solution of Y' + a*Y + b*S = 0,
I code