Why does LO calc shutdown when copy and pasting cells? Is it a known bug?

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When copy/pasting large quantities of cells [in my case from a csv dump file to another ods file] LibreOffice unexpectedly shuts down. This has made newer versions of LO unusable for me. This is probably not the best place to leave a bug report, but it is indeed repeated behavior with 4.4.x [I tried both 1 & 2 so far], but copy/paste works just fine [without unexpected shutdown] in 4.3.6 [Windows 7, 64 bit]. So I've just been uninstalling and rolling back for now. Just thought it bears mentioning and wondered if other users have experienced same. So, basically, How do I file an official bug report? and Who else is affected?