I've never heard of problems with silicone but I have heard of problems with regular vinyl tubing.
This matches my experience as well.I do not believe silicone tubing and Star-San is a problem.
Vinyl is, as Micro says, an issue. I have a 5-gallon bucket of Star San in which I sanitize things for brew day. I left vinyl tubing in there for an extended period and it developed a slime on it which I can only conclude was the vinyl deteriorating.
I also keep the lids to my Bigmouth Bubblers in there, and they have silicone gaskets. Never noticed any issue at all with that, even when they are in there for an extended period.
I should note that those gaskets don't come in contact w/ the beer so it's not an issue that way, but I can't discern any change to the silicon after weeks of soaking.
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