Number of problems since 2.4

Time: 10/28/14 Probably around 9AM CST
Frequency: intermittent
World name: Gilgamesh
Character name: Ambient Sena
NPC name:
Monster name: Twintania
Class/Level: MNK50
Party or solo: Full Party
In-game time:
Area and coordinates: Ragnarok Central Core

Ever since patch 2.4, I've encountered several problems.
1. Twintania invisible. Relogging did not fix the solution.
2. Random slow down, 1-2 FPS. Noticed mostly when walking down to battle area, or returning from death.
3. Unable to take ingame screenshot. Error message saying "Screenshot Failed."

CPU: AMD FX6350
GPU: ATI R9 270X
RAM 16GB RAM
128 gb ssd