Calling multiple qp problems

[Michael Goffioul]

A similar problem was fixed a few days ago. See
http://www.nabble.com/panic%3A-Segmentation-violation----stopping-myself...-td16859691.html#a16865091.

Although I cannot check, the probability is high that it is the same problem.
Unfortunately, the problem has been fixed *after* the 3.0.1 release. But
I'll try to get the fix in the next 3.0.1 binary package anyway (it's a rather
simple change to include).

Michael.