Win8.1 Preview+LO4.1.1 click odt=explorer closes

newbie to LO. Trying to move Getting Started odt file. I can double click & it opens ok. One time only I was able to select it and copy/paste within the same folder. But after that, the moment I try to select it (or any other odt) for drag/drop or context copy, Explorer disappears. Every time. I see the context menu appear briefly before Explorer closes. Not having this problem (yet?) with other files. FWIW: Also using Classic Shell.

User error, Win8.1 bug or ?