ISDS (Investor-State Dispute Settlement) is a sane concept. The implementation might have problems (for example closed courtroom "trials"), but it's not about protecting profits. It's about protecting equality and fairness for all before the law, and in case of States, holding them accountable to make fair and egalitarian laws.
What's the typical example? A random Company invests in a country, sets up a nice subsidiary starts doing business, everything is legal. But the country (the State) sees that it's taking up the market, uh-oh,
a) better make a law against whatever they are doing, or b) better make a law against (that specific or all) foreign companies doing whatever.
Which one(s) is (are) problematic?
Also, the other thing, fairness, comes in when a State wants to buy out a company but doesn't want to pay market price. Basically eminent domain without unfair compensation.
The same goes for ending tax breaks (or other investment incentives) sooner than promised. Because that's a breach of agreement.
Your link (publicfinanceinternational.org) refers an article from globaljustice.co.uk which has a list of problematic ISDS arbitration cases, that's the real data, anything else is just fluff. ( http://www.globaljustice.org.uk/sites/default/files/files/re... )
Let's look at the big bully US agribusiness vs Mexico (the rules of arbitration are set by NAFTA).
http://www.state.gov/s/l/c42198.htm
http://www.italaw.com/sites/default/files/case-documents/ita... the concrete "award" (findings of the tribunal).
It turns out that these tribunals are looking at laws and apply them. Like courts. And they are much likely more objective than any court in either host country. And then that award was reviewed by the courts of a place chosen by the parties (the Ontario court system).
Seems quite like due process to me.
I'm not saying all of the cases are jolly good and there was absolutely no problematic awards, but just looking at the Vodafone vs India one, the "retrospective capital gains tax" hits us and makes you wonder, what the fuck were the Indians thinking, first rule of how to legislate. ( https://en.wikipedia.org/wiki/Legal_certainty )
But enough on ISDS. There are big problems with TTIP, but not this one.