I want to be kept abreast of this graphics issue, if you don't mind.
Certainly. I only thought it was worth mentioning that I made it somehow...
I have not yet found a pattern.
I found so far that walls in slots 2, 14, 15, 17, 21, 23, 29, 45, 63 all have problems when the most distant wall is depicted, but maybe this is only accidental - my guess is that it has something to do with how the most distant walls are displayed together with neighbouring walls (maybe a 5 vs 7 most distant walls problem?). It seems that doors in the same slots are not affected.
Sometimes the most distant wall in the center of the 3D view is affected, but for some slots the wall is displayed correctly in the center of the 3D view, but not on the left side.
Interestingly, sometimes it seems the upper left 16x19 pixel of Slot A is shown instead of the correct slot as I wrote below, but sometimes I also see just magenta coloured walls (indicating that the frames of the wall files are shown).
As far as I can tell I use only walls of type 5.
I would be interested to know if you have similar issues in your designs when using the same engine version...
While it may be unwise to mention another issue in the same thread: Is the config file read automatically? I ask because I changed the custom text colour in the config.txt file inside the design folder, but it does not seem to have an effect.