Inserting SignalTap without re-routing design

I think I know what the problem was. I'm using Qsys in my design and as a first step I generate my design files. This makes it necessary for me to set the design partition property of my Top partition to Ignore source files changes.

Once I did this I could get signal tap to work. But not every time.

During the routing stage, my fitter attempts to route a few times and then it fails. I have confirmed this by compiling the design with no/just one signal in my .stp file versus a bunch of signals. It works in the former case but not in the latter.

Please see the attachment for log messages. Is there a work around for this?

thanks