Hi 
When renaming or creating a back-up i tend to find it's better to use the
date in reverse order, eg .2014-01-02, rather than .old or .backup. Makes
it easier to figure out which ones to delete and which to keep.
In the past crashes have been due to either;
1. java issues or
2. user profile issues, such as Extensions that don't work in a newer
version of LO
The easiest one to test for and quickly fix is 2. Also java issues are
much less likely now unless you use the internal back-end in Base,
sometimes accessibility bridges to screen-readers, some wizards. We could
probably help you avoid most of those - for example by migrating to an
external back-end in Base. However it's quite likely that you have java
switched on even though you don't need it at all. If you do need it then
you might need to try out a few versions of java, hopefully just their most
recent update might work but it's never certain.
Also a 'few' months ago a couple of people seemed to experience crashes
that i don't think we ever quite figured out. I think we even started to
look into hardware issues.
LibreOffice itself is rarely/never the problem but hopefully we can help
you find which 3rd party issue is causing the problem. Hopefully it's just
one of the Extensions/Add-ons in your User Profile.
Regards from
Tom 