Problem: the import was stuck in a endless loop. 

The project was containing some huge segments with 147 words, so the 150 word limit was not reached. The timeout of the socket connection was to less (just 10 seconds, the assumed timeout of 300 seconds was not used at all), so a timeout was triggered before the bigger segments could be tagged. The import was now caught in the endless loop. The low timeout is fixed, but basically this can happen due seldom circumstances where the long timeout is not enough for the nearly huge 147 word segments, since the size and timeout was defined by testing just a few segments.

The best solution would to count the the tagging attempts of such segments, if they are more then once, they should changed to status retag which then means that this segments are sent single to the tagger.