STEPS TO REPRODUCE
1. Launch iClone 6
2. Load a project with Path Release Key and Release Transition Key
3. Launch Timeline, select a random frame, then pick the character
4. Navigate to Modify > Path, click "Release" button
5. Expand Constraint track of the character
6. Choose the key of the selected frame on Path track, and move the transition key to the selected frame

ACTUAL RESULT
The character disappeared

EXPECTED RESULT
The character won't disappear