I re-compiled Scheme with the one-line fix. build fluxus from git I can confirm that this now works (or more accurately it reports that that line shouldn't work) I can't reproduce your crash at subsequently hitting F6.
This is good, of course, but now it seems that your version has some bug that mine doesn't, which I find a bit odd. Did you commit to git since that mailing list post? Do we perhaps have some sort of other issue? Yours, Kas.
