I tried positive values as well, but the same thing happens - the stim from stimlists (jumps to trials 1000-1063) aren't appearing in the data/log files. Not sure ...

The csv file I uploaded is a scratch one that I use while editing. I'll put in the ttl values once all of these things are sorted out (to make sure it syncs with our acquisition computer and what not). For the fun of it, I inputted the values anyways to see if this resolved the stim logging issue, but it's still unchanged.