Originally Posted by SchockT
You don't provide a whole lot of information to work with! Are the chainplates connected to the new bulhead?
If so, is all the tabbing on the new bulkhead intact? What kind of tangs connect the shrouds to the mast? If it is T-ball or something like it, maybe they werent properly seated when you connected them, and then they "popped" into place when you started sailing?I think a careful inspection of your new bulhead, chainplates and standing rigging is in order before you sail again!
Whether T-ball style or not, it sounds like something was not properly seated, and popped into place during sailing, especially based on the OP's insistence that all tabbing and chainplates are solidly intact.
BTW- any rigging that is "tight as a fiddle string" is TOO TIGHT. That's a good way to wreck a chainplate, or tabbing or induce "hogging".