tk2d ver : 2.5.8.5
Unity ver : 2017 1.0f3
I'm making a prototype with tk2d.
I made 5 tk2dbuttons. The sprites in those are supposed to be changed with clicks.
But with about 2% of possibility, sprites turn into rainbow.
It doesn't happen everytime and I checked all sprites in SpriteCollection. Checked called sprite number from Debug.
SpriteCollection has no vacancy between any numbers.
So called number had the sprite but it didn't displayed.
(ADDED 12 AUG)
I tested it in Older Unity 5.6.0f3, 2D Toolkit 2.5.7
The same symptom occurs.