Lucas Chess help

So I have used Lucas chess before, but very recently I have run into a problem that I have never seen before. Basically, when I input a new (specific) line in the personal opening guide (tools-openings-personal opening guide), it won't be saved. 

In fact, it is even stranger than that. I have put in lines that have been saved recently. But there is a particular line (1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6) that just won't save. It saves everything up to 4. ... Nf6, but then after that it's all gone! And when I add the line in a second time (I think I have about 7-8 moves deep with notes) all of the notes that I made before come back as I add the moves in. It's like it is there, but somehow it also isn't there. It's strange and I've never encountered this problem before. 

I don't really expect anyone else to have had this problem, but what would you recommend I do to fix it? 

Thanks 

Send an email to lukasmonk@gmail.com, with the file that gives you the problem and he will solve it for you.The file is in the program folder, subfolder UserData/OpeningLines with the name of the line.

Thanks very much Jesus. I just opened Lucas, and all of my lines are magically there again. 

If it happens again, I'll be sure to send the guy an email. DIdn't know they had a dedicated guy to support. 

Installed Lucas Chess(R) 2026 Mar 28. I'd like to have it present tactics puzzles from my own collection of pgn tactics files. In it's Tactics mode Lucas will only present puzzles from it's built-in files. If I open one of my files, it just displays a table listing each puzzle and a small board on the right with the position.

I have dozens of files containing thousands of tactics puzzles in pgn format. I'd like a program to present them like the Android apps Chess PGN Master or the old iChess. Is there any way to do this with Lucas chess or any Windows program ?