There seems to be a problem with using the 555 model as a RESET terminated timer as well as an R-S latch.

The file: "555 problem 1.asc" shows it wired as a reset-terminated-timer, and the low-going pulse on the RESET- input retriggers the one-shot instead of terminating the pulse early.

The file: "555 problem 2.asc" shows the 555 wired as an R-S latch, but the output is never driven low with a pulse on the RESET- input.

 