In avogadro Cylinder::freeBuffers() we call:

delete [] d->normalBuffer;

which causes this error on startup:

"The block at 0x... was not allocated by _aligned routines, use free()"

Code to initialize the variable:

Eigen::Vector3f *normalBuffer;
d->normalBuffer = new Vector3f[vertexCount];

Eigen2: At revision: 908503

Compiler: MSVC 2008

Any ideas?

Thanks for the report, should be fixed in svn now.