This should be a fairly simple question for a local RE attorney to answer, if you give them an accurate account of events.

One event will be held in your state I am attending the one in NYC as that is where I am from.

They can call your servicer up, which can initiate a chain of events which will get your mortgage  "called", which is finance jargon, for "pay me my money now because you broke our contract".

Inadvertent ponzi schemes are more common with funds than they are with one-off syndications and they generally occur because the promoter fails to keep their books in order properly.  

As my luck would have it, a month after closing on one of them, the husband & wife had an "event" that landed the Mr. in jail.  

the difficulty selling one property in the future did not occur to me

Not myself, but there are a lot of people out there that treat these scenarios as "risk vs reward" events and skirt the grey areas.

If it's a weekend event and they're asking for thousands, turn around and run.

Condensation occurs when warm air meets a really cold surface or visa versa.

Also, if it is a note secured by real estate it will be best to list the IRA in firs position in the event of default by the borrower.