Upgraded Fireball, now it will not equip to the hotbar

Exactly as I said. I upgraded Fireball from 16 to 17. I have tried to equip a lower level fireball and it works fine. My INT is 184 (required 164). Also, all of the detailed information is blank and it says "This information is currently unavailable". The area with the weapon choices is messed up as well.

Adjustments to the gem are (these all preexisted before the upgrade):

+20% quality
+3 Levels from Global Modifiers

The same happened to me, when upgrading my gems to base lv20 (previously base lv19) and adding 20% quality (previously 0%). Such gems had supports inside, and were working perfectly before - the probable bug cause is related to increasing the base level & the gem's quality while having it equipped in the skill's tab.

I relogged, reopened the game, reopened Steam, changed the gem's position in my skills slots (bottom right corner of the interface), changed the support gems, changed the keybinds, changed skill slots (skill tab), changed from MnK to WASD and back to MnK, and nothing seems to work.

Only 1 temporary workaround: whenever changing instances, manually click your skill (in the skill bar, bottom right corner of the interface), replace it by choosing another skill, then put it back to the original bugged skill. Will have to do it again whenever changing instances (eg: going to hideout, entering a map, etc).

On skills such as Frost Wall, even the charges indicator (3, as per default) stops appearing, indicating the bug. All gem requirements are okay, the gems are not grayed out nor missing information on my end.

One note to add is that, when upgrading gems exactly like this bug report, but choosing gems inside triggers (such as Cast on Crit), it works normally and no bug is seen, nor is there any impediment for the skill to be used (in this case, triggered).