sfk 1.6.6 Oct 8 2012, Windows XP.
error: cannot rewrite file: 1.txt
1 files checked, 0 changed.
1 errors occurred.
MEM LEAK: adr 00C350FC, size 1028, alloc'ed in sfk.cpp 23095
MEM LEAK: adr 00C350C4, size 16, alloc'ed in sfk.cpp 17126
[SMEMDEBUG: 24 new's, 22 delete's, 0 errors, 2 leaks]
That's a small thing to report, actually - but probably it will lead to big improvements during the investigation :)
It is a memory leak indeed, and will be fixed in the next release.