Hi, Patrick.
Yesterday night, during the last hour before midnight, I made a lot of attempts to send the 8x8 timed. Each time the program seemed to collapse since, at the same time, it was not possible to open a new Calcudoku page. Finally, I lost the two possible points . However, everytime I kept the "0 done so far today" message giving me the possibility ot trying it again and again.

This morning I am having the same problem. The programs hungs up and it is not possible to open a new page during around 5 minutes. After this, it normalizes.

I guess this is only my particular problem and possibly related to the fact that the pool is exhausted for me (I had this problem in the past but with other sizes).

I will check.

It is true that you are always the "canary in the coalmine"

edit: you are right, you've exhausted the pool of timed 8x8 puzzles
(well over 4000 puzzles )

some time ago I added an automatic warning when this (almost) happens for bonus puzzles,
but not yet for timed puzzles..

I'll start adding new ones.