Quick fix: a broken theme or a stale display setting is usually to blame. Delete the active theme (Options → Themes → Default), then set the WinRAR shortcut to compatibility / disable scaling if it persists.
WinRAR Blank / White Screen — Fix
The window opens but shows nothing, or renders as a white box
When WinRAR launches but the window is blank, white, or only partly drawn, the program is running fine — it is the rendering that fails. This is almost always a display-scaling, graphics-driver, or corrupted-theme problem, and each one is quick to rule out.
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