[Resolution keeps changing]

1 hour ago, Michael Sant said:

When you close the game how are you doing this? Are there any crashes in the FM.exe for example?

After saving the game, click in "Quit game and exit"

[6 letter in team table in league profile view]

1 hour ago, alian62 said:

So oin the editor have you ticked use long names only

No... and also in the proof posted here I didn't use any editor files, just the default database provided by the game.

[I'm forced to play U-19 pre-season games]

There are several tabs you need to set the manager in order to him fully have charge of the any of the reserves teams.  The first is in the "Staff Responsibilities", the second is in the "Training Responsibilities", the third is in the "Tactics Responsibilities" and the last one is in the "Match Responsibilities".  If you have set in all of this tabs and still have problems, then your game is bugged... In mine, I don't have this problem.

[Resolution keeps changing]

Same here, when changing the "preferences", turned the game to be windowed, and the size in 85%, when closing the game and opening again next day it appears in full screen and 100%.