# \#pf

**URL:** https://swi-prolog.discourse.group/tag/pf/70.md

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## [Pfc - upgraded, seems to have some issues with forward chaining](https://swi-prolog.discourse.group/t/pfc-upgraded-seems-to-have-some-issues-with-forward-chaining/2676)

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**Author:** [@grossdan](https://swi-prolog.discourse.group/u/grossdan)\
**Replies:** 1\
**Last updated:** [July 22, 2020, 4:03am UTC](https://swi-prolog.discourse.group/t/pfc-upgraded-seems-to-have-some-issues-with-forward-chaining/2676 "2020-07-22T04:03:05Z")

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Hi @DouglasRMiles, First, many thanks for the great effort to upgrade pfc. I managed to reinstall it. I noticed a slight problem, with starting it up, as follows: Welcome to SWI-Prolog (threaded, 64 bits, version 8.1…