Description:

• Dialog Options → Appearance → Color,
• the Example Text in the lower right corner,
• its background color is sometimes not shown.

How to reproduce this issue:

• Default theme (Options → Theme→ Default),
• Options → Appearance → Color,
• (supposing no customization, i.e. the default colors),
• click “Conditional Jumps” (in the “Instructions” section),
• press ↓ key (or click to the next “Unconditional Jumps”),
• the Example Text in NOT in the yellow box.

My suspicion:

• Selecting the item immediately after the item with the same background color
  shows the Example Text without the background color
  (i.e. as if was selected x - transparent background).

Workaround:

• Select the item with the different background color,
  then select the item of your interest again.

Version:

• May 8, 2021, 14:14:31 (Help → About)
• May 8 2021 (TitanEngine) (in the right-hand side of the menu bar)

OS version:

• Windows 7 Ultimate 64-bit Sevice Pack 1