On the Theme Park Collective Facebook page, it says:
"To clear up some information about THE SMILER.
The reason it was closed for a few days was due to the footers at the top of X-Sector having structural damage. There was also a issue with the first lift hill. This part was installed early last night (3rd August). Gerstlauer had a 12 month supply of this component but THE SMILER went through the lot in 1 month! There is also a slight subsiding issue with the first lift hill but its nothing major.
THE SMILER reopened on the 4th August 2013 at 9.40 and had a minor break down at 12.45 in which the queue line and trains were evacuated. It was open again within 2 hours with no further problems throughout the day."
Doesn't sound too good