Constantly crashes, most of the time I cannot even get the file open, some files open then crash when I try to do something. This is the same as Alpha 1. I use Libreoffice every day, 4.3, and 4.4.4 does not have this problem with these same files.
4.x and the developer branch have 2 different user profiles, so you might wanna reset the one for the dev-version. https://wiki.documentfoundation.org/Documentation/UserProfile But instead of renaming libreoffice/4, rename libreofficedev/4 to something else.
5.0 beta1 still had a lot of crashers due to big internal work on the UI. Could you test beta3 that was just released and see, how it works for you: http://dev-builds.libreoffice.org/pre-releases/win/x86/
This really isn't a valid bug report - "Constantly crashes" doesn't give any actionable bug report. If you're still seeing crashes please report each crash individually with steps on how to reproduce, information about your version of LibreOffice and information about your computer (at least OS). Marking as INVALID.