I have designed a structural and run Shed 2.stdanalysis, one member (angle Iron) got fails against the specified loading? which doesn't make sense as the unity factor of that member is far away from its connecting members..
What version did you run this on? I ran it on 22.04.00.40 and didn't get any failures.
I don't think it is causing the problem but you have 3 parameters. Only one of them seem to be doing anything. You also have a "FIXED GROUP" command that looks useless to me. I commented all that out and got the same results.