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Ping Pong Action doesn't work correct.
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Description

System Information
Win7 64 / Radeon HD 6900

Blender Version
Broken: 2.7 19e627c
Worked: (optional)

Short description of error

After a couple of Ping-Pong Cycles, the next Cycle begins reverse. In my Test after 5 Cycles, it makes the Jump. But this does not happen always.

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps

Make a simple Keyframe Action, and let it Play as Ping-Pong Action.

(Possibility to attach a .blend would be nice.)

Event Timeline

Doc Holiday (doc_holiday) set Type to Bug.
Doc Holiday (doc_holiday) created this task.
Doc Holiday (doc_holiday) raised the priority of this task from to Normal.

I can confirm the bug.

system:
windows 7 64bits. Blender 2.70

You should be able to attach a file with the "Upload File" action.

This patch fixes the bug but the code from BGE actions is very confuse.
For example, although we are in Ping pong mode we never enter into the switch case ACT_MODE_PING_PONG in BL_Action::Update function as it is processed in BL_ActionActuator::Update.

To comment that this bug seems a duplicate of this other bug T29820