Created attachment 199995 [details] Here is the file I have a calc file with 21151 lines. Today i installed version 25.2.1 And i tried to mark the last lines. But i could not. So i rollback to 25.2.0 The same there. When i used version 24.8.4 everything worked fine. After some testing i find that using versions 25.2.X i was able to mark until line 18577 but not from 18578 and beyond.
Created attachment 199996 [details] The file with the problem
*** This bug has been marked as a duplicate of bug 164403 ***