### Please describe the problem.
git-annex crashes with "git-annex: createSession: permission denied (Operation not permitted)" when creating the first repository. Trying to start git-annex webapp after that crashes again.

### What steps will reproduce the problem?
* Download standalone tarball
* Unpack
* Go to new folder, call "git-annex webapp"
* Click Make repository 

### What version of git-annex are you using? On what operating system?
git-annex version: 5.20140606-g48793b6
build flags: Assistant Webapp Webapp-secure Pairing Testsuite S3 WebDAV Inotify DBus DesktopNotify XMPP DNS Feeds Quvi TDFA CryptoHash
key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 WORM URL
remote types: git gcrypt S3 bup directory rsync web webdav tahoe glacier ddar hook external

Ubuntu 14.04 LTS

Linux eee 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:02:19 UTC 2014 i686 i686 i686 GNU/Linux

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log
$ git-annex webapp         
Launching web browser on file:///tmp/webapp3414.html
git-annex: createSession: permission denied (Operation not permitted)
WebApp crashed: createSession: permission denied (Operation not permitted)
$
# End of transcript or log.
"""]]

> provisionally fixed; [[done]] --[[Joey]]
