openHAB 2.1 freezing when updating items file


I’m getting an odd problem with OH2.1 that I didn’t ever see with OH2.0 - occasionally when I open/edit an items file, openHAB completely locks up, with the Basic UI unavailable and all rules ceasing to be processed.

Anyone else seeing this? What’s the best way to log and report it? (I’m running the apt-get package on Xubuntu