Timing-Driven Synthesis is skipped...

I've be having the same problem.

I've got two projects (CIII's, but different sizes) that are fairly similar, both using alot of the same constraints.

One refuses to do timing driving synthesis, the other runs perfectly.

I've tried going thru and removing the bit that are different to no effect so far. The error message is of course useless to try and track down the cause.

Been meaning to file a tech support on it.

I'm using post_message in the successful build.