In July 2011, I wrote a short piece that was published in the National Creditor-Debtor Review about collecting foreign currency debts in British Columbia, using a statute called the Foreign Money Claims Act. The article highlighted some of the concerns that creditors faced between 2008 and 2011, when the value of the Canadian Dollar dropped by almost 25%, and then rebounded. You can read the entire article here (starting at page 25).
Fast forward to April 2014 and it appears that currency markets are relatively volatile once again: from a high of $1.03 (against the U.S. Dollar) in September 2012 , to a low of $0.89 in March of this year.