[Pywikipedia-announce] [BUG NOTICE] interwiki.py removes content from pages, cause unknown

[Maarten Dammers]

Hello all,

This is a notice to all active interwiki bot owners. Today, we have 
received two worrying bug reports of interwiki bots, removing content 
from pages:
  http://nl.wikipedia.org/w/index.php?title=Blankenbach&diff=prev&oldid=27331067
  http://simple.wikipedia.org/w/index.php?title=Mettau%2C_Switzerland&action=historysubmit&diff=3060418&oldid=1249270

Unfortunately, it is not possible to reproduce this bug by running 
interwiki.py on the mentioned pages. As such, we have no idea what this 
problem was caused by.
HiW-bot (nlwiki edit) was running r9558 at the time of the edit. We 
would like your help in tracing the cause of this bug. If possible, see 
if your bot has made any strange changes, and report them in the bug 
thread for this problem:
  https://sourceforge.net/tracker/index.php?func=detail&aid=3414669&group_id=93107&atid=603138#

This might be related to the MediaWiki 1.18 deploy, see 
http://blog.wikimedia.org/2011/09/16/mediawiki118iscomin/ for more 
information

Thank you for your cooperation and understanding,

The pywikipediabot developers