Somehow my artwork got converted from 300->72 also, but it didnt change the pixel count. It was still (300x24)wide by (300x8)tall. I didnt even notice for a while, till I had to measure something and it said the total width was like 100"
I was like WTF, but was able to rescale it to 300dpi without changing the total dimensions, so no loss there
What I think happened was that I resized for a jpg snapshot, and when I reverted back to my .psd document it kept that setting, but it hasnt happened since, so Im stumped