Ok the exact process was:
Open mtgstudio portable.
Switch to collection from pool.
Add one random card.
Check to see if save as was working. (Was thread on this I was doing this for.)
Its greyed out.
Switch to deck from pool. (Wanted to see if save as was on for decks which I am assuming it is but I never do decks.)
But now I cant seem to add any cards unless I am doing it wrong.
Double clicking doesnt work and right click has it greyed out.
(Though I just noticed that Enter works even though its greyed out.)
Bug? I am assuming it is since I know double clicking adds cards for collection and I would imagine it shouldnt be greyed out in the right click.
..
OK I went to try and reproduce it but it saved state as being in deck from pool but its still greyed out in right click and double click doesnt work.
Enter works.