What scanner are you using? I've probably scanned around 100 - 120 frames of Provia 100F shot under varied lighting but no blue cast. In fact, Provia 100F and Velvia give me the best scans (among all films) when exposed properly. I use a Minolta SD-II. I use Vuescan 7.5.10.
Did you tweak your vuescan settings? I had to spend a looooooong time tweaking the settings till the scans were good. Vuescan is superb for slides, but I still use the Minolta s/w for negs - much better colours.