So I've been working on bug 13891, but got sidetracked by what I thought was a race condition as dlls/shell32/tests/shlexec.c was hanging.
Spent several hours tracing it to line 464 in dlls/ntdll/directory.c
if (stat( entry->mnt_dir, &st ) == -1) continue;
(read from /etc/mtab)
Turned out it was my curlftpfs file system, which tends to disconnect randomly and not unmount (doh!).
Anyway I hope to have perhaps some tests for this bug before I leave to Russia (on Sat morning), but unfortunately I might not be able to get this bug fixed until post-code freeze. Sorry :(
Misha