Hello Gilberto,
One last update. On a computer downstairs, I have an old version of LibreCalc running. I put my Omaha and Kearsarge spreadsheets on that PC. I had none of the problems with that version of Calc. No white lines, no flash of buttons, and I could replace the cloudy buttons on the Kearsarge spreadsheet and they remained orange after several cycles of open, save, close and re-open.
Next, I updated LibreOffice to 7.6.3. When I reran the spreadsheets, I got the flash of the buttons with a CopyDown, and the buttons on Kearsarge went cloudy after opening, saving and re-opening the spreadsheet. There were no white lines. However, it sometimes takes a while for them to appear. I closed the spreadsheets, shut down the PC and came upstairs.
Then, I thought maybe I needed to load a new image. I went back down, started the PC, loaded the spreadsheets, got the next image and tried again. I couldn’t get the buttons to flash, and there were no white lines. The Kearsarge buttons on the Setup sheet, which were saved as Orange, were cloudy when I opened that spreadsheet. I deleted them, replaced them with orange buttons, saved the spreadsheet. The buttons were cloudy when I re-opened it.
It is very strange, to say the least.
This is the old version I had downstairs;
Version: 5.3.3.2
Build ID: 3d9a8b4b4e538a85e0782bd6c2d430bafe583448
CPU Threads: 4; OS Version: Windows 6.2; UI Render: default; Layout Engine: new;
Locale: en-CA (en_CA); Calc: group
Device name BasementTV
Processor AMD Athlon™ 5150 APU with Radeon™ R3 1.60 GHz
Installed RAM 4.00 GB (3.43 GB usable)
Device ID C7AE16A4-5E60-4AF6-A062-1EC5F426FE66
Product ID 00326-10000-00000-AA233
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display