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Problem solved guys and thanks very much for all your advice.

For some strange reason, it seems that one leg of one of the LED was just ever so slightly touching the case. I mean it was just slightly grazing it. This was causing the grounding issue!!

Sounds good thanks.

Ok I've reflowed the solder joints, including the jumper pins between boards and the wiring. One led is permanently on regardless of switching, although I can hear both circuits switching in and out when I stomp on each respective switch. So its an Led problem I suspect? Could it at all be faulty switches themselves?

I just cannot seem to understand this.

Yes I've made sure wherever the plugs are inserted into their jacks, none of the jack lugs are touching anything at all. There is no contact to anything, even though it looks like a tight squeeze. I'ts just bizarre that it doesn't work when housed

Thanks for your help guys.

Ive added a picture here to demonstrate.  I note that in this build, all the pots attach directly to the board so there is no wiring. I've checked to make sure:

1) none of the backs of the pots are hitting anywhere else on the pub.
2) even though the sockets are close to the PCB, with plugs inserted into the sockets nothing is still touching the pcb
3) PCB and pots/switches seem to fit well in case without any stress. At least they drop right in without having to wriggle or push anything into their respective drilled holes.

I'm just stumped.

Any help would be so appreciated.

Yes have checked the input and output sockets and the DC socket as well. They appear to be fine

Hi guys, could anybody help me with what I suspect is a rudimentary question with my build but is stumping me?

I have built the Q of B(2) circuit and it works fine out of its case. Whenever I house the thing it suddenly acts completely weird. Switching goes haywire and one switch either switches on two circuits or none. Turing pots goes weird etc.

I suspect the issue is possibly the metal case itself is somehow grounding parts of the circuit etc. Is there anything that I should be isolating from the case perhaps? - i.e. pots, input and/output jacks, switches etc?  The case is a standard 1590BB.

If its not a grounding issue with the case, would you guys have any idea why I've got this crazy problem?

Sadly build doc won't attach as its too large. I hope this doesn't mean I'm asking a blind question that nobody can answer!!

Thanks very much for any help.