Always label your developer expiration dates.
Long story short, I had 2 rolls of Kodak 400 Tri-X (one that I ran through my newly fixed FED 3 and the other through a Zenit 3M) Both of them were test rolls and I took some pretty important shots on them. WELL, apparently my developer was expired and the rolls came out BLANK. No numbers, no nothing, so basically the developer was completely useless.
So from here on out, I am going to clearly mark when my jugs expire and NEVER use them beyond the expiration date. Ugh…I feel so pissed off at myself for doing this. :[