I ran into a bug in PENG that seems worthy of note. Under certain circumstances PENG crashes when it tries to open a previously saved PCF file, thus making the file useless. After some time trying to figure out what the problem is, I think I've narrowed it down to saving certain PCF files that have grouped items in them. I've learned not to group items then save the PCF file, and to also save under various filenames so as not to lose to much work should I encounter this problem again.