Another undocumented change in the recent hotfix: the Mana & Health exploit got "fixed". However they used the simplest solution... you don't gain mana or health when buying items that increase the total mana or health. You will have to wait now until it fills up.
However, they oversaw something... when you drop the item again... you still lose the amount of health or mana you would have normally gained in the past! So if you have a total of 1000 Mana, and buy an item that gives you 500 Mana, the total will increase to 1500, but the actual Mana will still be at 1000. When you drop it again, you will lose 500 Mana, leaving you with less than before. Same goes for health.
Btw. I haven't checked if the Mana and Health flags behave the same way.
I am really disappointed by this quick & dirty fix. They should have just introduced a new data structure so that every Demigod can track the items that he picks up and drops during the game and store the actual amount of mana or health that he lost when dropping the item.