This bug was filed from the crash reporting server and is br-6dd7fedd-94fc-412f-a640-abb0ffde3ea2.
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please see         bug 157975           by me which explains the history of this.

it is also the same in writer as well as calc, i now find.  the crash is always in the same place in ucrtbase.dll.

if it is an odt/ods file then i get file cannot be written, if an xls/xlsx type then a crash.  if i close and open office, all ok (for now).

this is now happening all the time - sometime after office has been open for a while (? few hours), something happens and the open file can be viewed and edited ok on the screen but the underlying data cannot be saved.  if i try and open a ods file, i get the file cannot be written error.

this happened once a few weeks ago and now is happening every day. possibly i upgraded a few weeks ago, not sure.  that would have been 32 bit - but i have upgraded again and tried 64 bit and it is all the same.

i am not having any other problems in windows etc.