@pnm:
It could have just been that demand was high during the time that I was working the puzzle.
But I doubt it.
I did not return to this puzzle this morning until after I solved a few others.
I had no problems with saving while working those other puzzles.
And when I was done with the 7 x 7, I did a test with the Easy Sudoku and had no problem saving.
Also, I am pretty good about saving puzzles if I am about to leave a session, or change puzzles.
This particular puzzle was not saved from hours earlier.
@ Marble,
Congrats on breaking into the top 900.
For me, it was milestone to realize I had earned 1 000 pts.
It takes a while to gain ground. You need to stick with it.
I think you need to ask your parents if they would consider spending the money to gift you a subscription. Those extra points are worth it.