Results with expired Old Brown Glue?

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So like maybe a few others, I'm here the day before Christmas trying to pull off a pretty large project for my daughter.  I'd like to use the hide glue I have. But I read where it's not advisable to use it if expired.  What are the cons to using it if expired?  Thanks. 
from what ive read you can if it looks to be good but may not have the bonding strength ? youd probably wanna do a test first, but sounds like you dont have the time ?

working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

Ha yeah, we're already in the natural finish stage. Lol. 

I have a couple of minor glue ups, so I'll try it on that and see what happens. 
Does it smell like glue or like a critter crawled into the heat ducts and died? If the former, use it. If the latter, might be worth running to the store.

May you have the day you deserve!

Rub some between your thumb and finger, then start tapping them together.  If fine strands of glue begin to form, it's still good. 

Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

So I applied some after heating it up and it spread fine.  The squeeze out started to gel up and look like a booger.  Is that normal or am I screwed?  It does start to get tacky on my fingers .