In a new document, go to Document > Settings > Text Layout > Table Style and change from Default to any of the other options (I've tried most of them). Click OK. Now click on the Insert Table icon and insert a table. (I used a 2 x 3 table.) When I do this, I get a SIGSEGV. windows 10, LyX 2.4.2.1 (bug also present in 2.4.1) Andrew