[SyncEvolution] Comparison was impossible.

Hi all, since early May I am using syncevolution from command line to sync my bq E4.5 against my desktop machine syncevolution syncml-http-server. Everything was working as expected. Since mid of June (according to the logs) I permanently get the 'Comparison was impossible.' warning for all (memo, contacts, calendar, todo). I additionally set logdir and maxlogdir entries as suggested in [1] (which where commented out before). This mainly changed the location where the dumps are written to and prevented log directories from being auto-deleted during the following update, if they do not contain changes. This makes analysis easier. If I look at the previous database dumps, that are given as comparison sources in the log files [2], all the files (e.g. VCARD-entries for addressbook) seem to be there and contain reasonable data. A diff of a previous *.after-dump and its successor *.before-dump will show the expected changes, if an entry was modified. So for me its not obvious, why I get the above message. Any ideas what else can be causing the message? Marc [1] https://lists.syncevolution.org/pipermail/syncevolution-issues/2009-Octob... [2] http://gut-informierte-kreise.de/syncevolution-log-Comparison-was-impossi...