Perplexed, Montenegro is a wonderful place, I say it with hand on heart, and it'd be great to buy, but I just found it a little too dodgy, for now anyway, but by the end of this year there might be some sort of resolution (I can't see them resorting to civil war, the EU and UN would not want it to happen).
I know of only one good agency operating in Zagreb, I don't have their details handy but will PM them on as soon as I get them. There is a drawback there, in the area, and that is that it's expensive enough to begin with. but you get your rentals and will be able to sell on.
In regards to title (John Gonne this is relevant to you and I guess you already have found this) that in areas like Dubrovnik, Split, Zadar etc there are as many (I honestly couln't say more) houses with problem papers than say where I live (Knin), where you'd expect it to be rampant! But once you have a good lawyer, know what to look out for and a good agency then you won't be sent wrong.
There was a lot of kerfuffle over new builds in and around Trogir, some irish agencies were involved and a lot of unhappy campers were the result, but the problem lay with the agencies being lazy and not doing their own legwork and relying on local agents to source and sell the property. I know personally of one that my colleague went down to check, he smelled a rat but all the papers seemed to be in order. He did a small check and found that there was a mortgage on the land and on the building too (a new apartment block), when he went back to the main agent they kept to the old maxim "No problem!"
Trogir is nice John, but not overly clean, a nightmare to get through (esp onto Ciovo) in the summer months and that 30mins to Split soon turns into over an hour in traffic (I have the saddle sores to prove it!). You could look at Seget (a little cheaper too) or even further north along the coast, Primosten, Rogoznica, Vodice, an hour covers the trip to Split plus you're an hour from Zadar Airport, just suggestions though.