Flying is not enabled - Swiftwolf's Rending Gale

[someguy201]

Title: Flying is not enabled - Swiftwolf's Rending Gale

Version: 3.1.1

OS: Windows 7 SP1 64bit Home Premium

Java Version: 7 Update 5

Description of Problem:

Swiftwolf's Rending Gale will occasionally kick players for flying. It works the majority of the time, but players on my server are frequently kicked with the error message "Flying is not enabled on this server".

Error Messages:

Flying is not enabled on this server.

Error Log:

2012-07-30 21:54:35 [WARNING] Afrogator was kicked for floating too long!

2012-07-30 21:54:38 [WARNING] Can't keep up! Did the system time change, or is the server overloaded?