I do have the same problem scanning my slide too. The colour will be slightly purple, sometimes the colour looks dull. Always need to play a bit in the PS.
The above photos looks so much different after some tweaking,
Your scanner might be dusty. I got a coolscan and the mirror get dusty quite fast. To clean the mirror i scan a picture, when the software reads ~100%, I turn it off and remove the film adapter. The mirror is now in the front. I use some cotton buds, drip some lens cleaning fluid on them and gently wipe the mirror.
PS : Just read your old thread, tell the shop to clean their scanner