yikes sounds like your step thing is messed up. I hid the control for step because its not properly implimented. To fix it go here:
C:\Documents and Settings\User\Application Data\Scirra
(where user is your username heh)
Search for 'step' and make it like this:
Step=0
If you have any other problems, just delete Construct.ini...construct will make a brand new fresh one.