Try naming your loopindex:
Conditions:
For "Step" 1 to 10
Actions:
Wait loopindex("Step")*0.1 seconds
Sprite Set X to Sprite.X + loopindex("Step")/100
Alternatively, you could just do something like:
Conditions:
Every 0.1 Seconds
Actions:
Sprite Set X to Sprite.X + 1
You might be able to get smoother movement using lerp though:
Conditions:
Every Tick
Actions:
Sprite Set X to lerp(Sprite.X,Sprite.X + 1,dt*60)
I've not upgraded to r155 so can't open your example, I made this instead with the 3 methods above (two disabled):
Example r152