Starting Libre Office on 6.7.1 from the toolbar icon presents a choice screen in a central window, with the white options area surrounded by pale blue shaded background. In my case, at the left and right sides of this blue background are two strips which are not filled in, but just grab the background image for the area at the time, before LO is started. Having just used the live USB on a desktop monitor for the first time, where the problem did not occur, I think I may have found a reason for this. When opening LO, LXDE seems to use a default window shape roughly conforming to the aspect ratio of the display. The desktop monitor is a 4x3 display, all my other units are 16x9 or 16x10, the area missed out by the background paint is the extra space in the widescreen ratio.
IBM System X3500 M4 7383AC1 (E5-2650 v2 2.60GHz - 192GB RAM - M2000 - NO OS/HDD)
$264.92
IBM Power S822 12-Bay Server System Power8 Core 3.42Ghz DVD-Rom Drive 64GB No HD
$399.99
IBM 7944AC1 System x3550 M3 Server 1*Intel Xeon X5650 2.67GHz 4GB SEE NOTES
$27.25
IBM Power 740 8205-E6C Express 8-SFF Power7 3.55GHz CPU 64GB RAM *No HDD* Server
$191.99
IBM System x3250 M4 Server Intel Xeon E3-1220 3.10GHz 8GB RAM No HDDs
$65.02
IBM Power 720 POWER7 00E6516 3.6GHz CPU 64GB RAM Server
$209.98
$16000.00
IBM Lenovo X3650 M5 2U 8x 2.5” CTO Rack Server – 2x HS, 2x 750W
$199.00
IBM 8203 E4A p520 Server 8203-E4A 4.2GHz 2-Core POWER6 32GB RAM / NO HDD USED
$99.99
IBM System x3250 M1 1U Server Intel Pentium D @3.4 2GB RAM x2 250GB DRIVES NO OS
$27.99