Boost prevents engaging.

Platform: Windows 10 Pro
ISP: CenturyLink
Type of Internet Connection: DSL
Internet Connection Speed: 10Mbit
Date & Time: Aug 03, 2017
Frequency: constant
Character Name: Nyarlko
Race: Hume
World: Asura
Main Job: MNK
Support Job: BLM
Area and Coordinates: Yahse Hunting Grounds (K-8)
Party or Solo: Solo
NPC Name: N/A
Monster Name: Bight Uragnite / Pinetorum

Steps:
1. Activate Boost.
2. Attempt to engage a monster.
3. Get the "You must wait longer to perform that action." error message.

Steps2:
1. Activate Boost.
2. Use Chi Blast on a monster, consuming the Boost effect. (Or manually cancel the buff.)
3. Attempt to engage a monster.
4. Get the "You must wait longer to perform that action." error message.

Unable to engage until the time of the initial duration of Boost passes. (Ex: If Boost has a 17sec duration, then you can not engage until 17sec pass even if the Boost effect is no longer active.)