I have recently upgraded my version of LibreOffice from 4.3 to 4.4.1.2 after the spell check stopped working. This corrected the issue and all has been working fine until a number of Microsoft updates were executed today.
LibreOffice Version 4.4.1.2 English (UK)
Windows Version 7 64 Bit
Microsoft updates:
KB3021952
KB3032359
KB2952664
KB3035583