I have the same problem on many computers at work. LibreOfiice hangs at startup, showing a white screen.
I did try all the thing you did (reset profile, add registry key, remove/reinstall, etc…) but nothing works. The only way to still use LibreOffice is to rollback to version 5.0.6.
Here is my opengl_device.log :
DriverVersion: 9.17.10.3190
DriverDate: 5-20-2013
DeviceID: PCI\VEN_8086&DEV_0102&SUBSYS_11B91734&REV_09
AdapterVendorID: 0x8086
AdapterDeviceID: 0x0102
AdapterSubsysID: 0x11b91734
DeviceKey: System\CurrentControlSet\Control\Video\{370D5BC5-5F1A-426B-950B-B7D60234B2B0}\0000
DeviceString: Intel(R) HD Graphics
And my dump.ini
OpenGLVendor=0x8086
OpenGLDevice=0x0102
OpenGLDriver=9.17.10.3190
UseOpenGL=false