Bukkit

What steps will reproduce the problem?
1.Place your wool
2.Jump onto it before it disappear
3.Repeat step 2 until you reach your target

What is the expected output? What do you see instead?
BlockPlaceEvent should be canceled before player jump.

What version of the product are you using?
Newest release version.

Do you have an error log of what happened?
None

Please provide any additional information below.

Hm, I was able to reproduce your problem.

However, I am already cancelling the block-place event.. seems like a "bug" with bukkit and I currently have no real idea to fix this.

@blablubbabc: Go

Basically same with worldguard etc, only something like ncp would fix it

The only way to "fix" this currently seems to be using NCP, or by switching from the woolblock to colored dye (for example).

Shall I switch from the wool block to colored dye?

@blablubbabc: Go

Correct. Actually visually dye would be prettier Imo.