"...Until about a month ago, all I showing on my account summary was Cusip ##. Then all of a sudden, the Cusip ## was replaced by the symbol ESUMF..."

Aha... Sounds like the warrants are now on the pink sheets. I just did a search in Yahoo and indeed the warrants are listed there as ESUMF.PK

http://finance.yahoo.com/q?s=ESUMF.PK