[Coin-lpsolver] Assertion failed in ClpSimplex

[E Bouillet]

I am using Osi/Cbc/Clp in order to solve a weighted bin packing problem. I 
use addColumn/addRow to generate the problem, do a writeMps to make sure 
that it's correct, and solve it using branchAndBound - I am not an OR 
expert, and I am not sure that I am using the OSI interface properly - but 
that works for small problems.

However when I try a larger problem, it runs for a while, and I can see that 
it converges to an optimal solution, until it fails an assertion  
(fabs(theta_)>1.0e-13) in ClpSimplex.cpp. Ignoring that assertion fail 
doesn't seem to bother Clp, but I am wondering what is the impact of that on 
the solution and if this happens because I built the problem improperly. I 
couldn't find anything in the recent coin-lpsolver archives about that and 
would greatly appreciate any help.

The package is compiled for windows XP using VC++.

thanks!
eric,