Can't see any detail on planets with my new Celestron NexStar 130 SLT Computerized Telescope
Mars is a small planet and currently far from Earth (just over 1 Astronomical Unit). Therefore, it currently appears to be very small -- smaller than 9 arcseconds. At that size, it will look like a small disk. 

Based on this one observation, I think that no conclusion can be made about any possible problem.

Also, a 130 mm f/5 scope is rather short for planetary observing where you want high magnification. This scope is better for wide fields of view, such as the Pleiades or Double Cluster.