It seems like that instant preview is not working on windows. Investigating a bit, it seems like dvipng just hang forever, see reported bug in here: https://lists.nongnu.org/archive/html/dvipng/2025-01/msg00000.html
The workaround I use is to add `-d` flag to the dvipng call in lyxpreview2bitmap.py (line 524). LyX 2.4.4, Windows 11, TeX live 2025, dvipng 1.18
-- lyx-devel mailing list [email protected] https://lists.lyx.org/mailman/listinfo/lyx-devel
