Thanks everybody for discussion. It took only 6 days between noticing the problem [1] and finding the cause [2]. I wish the process  didn't require so intensive communication, because without holidays I'd probably gave up on this. =) It's good that I know English.<div>

<br></div><div>1. <a href="https://bitbucket.org/techtonik/python-pager/changeset/3e3d0700ba5f">https://bitbucket.org/techtonik/python-pager/changeset/3e3d0700ba5f</a></div><div>2. <a href="https://bitbucket.org/techtonik/python-pager/changeset/ffe9da2d5316">https://bitbucket.org/techtonik/python-pager/changeset/ffe9da2d5316</a><br clear="all">

-- <br>anatoly t.<br><br></div>