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Most likely it is a wiring mistake of some sort, one that didn't affect the voltages. (Like a bad solder joint or missed connection.) Hope you get it working, the Shredmaster is a GREAT pedal.

I'm eager to build a shredmaster on vero, and can't remember if the result of this thread was that the layout was good, or corrected, or pending verification...

Have a read through the links I posted above.

Ah, shoot, sorry man.  It's already beer o'clock in the Jopn household, so I missed the answer being handed to me on a silver platter.

Carry on, nothing to see here...

I built the second layout I posted in that lost thread, and it works great. All controls respond as advertised, and there's less oscillation issues than my first layout (that was based on the different 1992 schematic); I only had oscillation with all controls dimed, and that's with everything hooked up using test leads bunched up in a mess of wires. I expect this to work without issues with proper lead dress in an enclosure.

Reposted layout:
http://www.sabrotone.com/wp-content/uploads/2013/06/ShredMaster2.gif

If you still have issues, did you check for silly mistakes like using a 10k instead of a 100k etc.?

Can you post pics of your board and the vero you used?

This project was sitting on my bench, not working, for months and months and yesterday I decided to re-visit it.
I abandoned the layout I was using because I just couldn't get it to work (and I'd made a bit of a mess of it while troubleshooting)
I decided to give this layout a go: http://tagboardeffects.blogspot.com.au/2013/01/marshall-shredmaster.html

After un-soldering all the components from my failed attempt and starting again on a fresh bit of vero, I'm happy to say I have a fully working Shredmaster!

This doesn't mean that the first layout doesn't work (it's been verified) it just means that *I* couldn't get it to work! haha
Anyway, it sounds great and I'm really happy with it.