Thanks a lot everyone.
First, I went to PCC and made sure driver "NVIDIA GeForce 6100 and later" is installed.
Second, I checked synaptic to see all updates applied. Still LibreOffice not installed in menu.
Third, I noticed LibreOffice manager and installed LibreOffice using that. Same issue with LibreOffice window.
Last, I downgraded x11-driver-video-nvidia-current and dkms-nvidia-current, restarted.
Now all applications are good (office, konsole, synaptic).
Thanks again guys!!!