Split Screen and Multi Window Screen Redraw Issues (diagonal slash)
I have the same error occurring on two machines (different Adobe accounts) - both fresh (a month old) installations of InDesign 2026 (V21.3)
Whenever viewing in Multi-Window (two documents side by side) or Split Screen (same document with two viewports side by side). Making minor edits often causes the top portion of one window or the other to go blank diagonally across the screen(see images). It gets filled in either white or the pasteboard color.
Scrolling up/down will correctly redraw content that comes into view, but whatever was already in the frame buffer stays and the blank area just scrolls up/down until you completely scroll to all new content.
This seems to happen whether either window is in "NORMAL" or "PREVIEW" mode and often when switching focus between windows, typically in the window losing focus. If the window receiving focus already has the blank diagonal area it briefly shows the full page then the diagonal comes back. In some cases both windows can have the diagonal slash across them.
Please remove whatever moronic new AI tool got shoved into the software and broke this basic function that has worked fine for 20 years - I have actual work I need to do!
Ryan G
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