I had the same problem loading caches into my Nuvi. The problem is with the way some logs are written using Emojis from the Apple operating system. Example can be found in cache GC3B1AQ Geo-Idols III – SuperCacherMan log by mkeiron dated 03/24/2013. The charcaters between “unsignable & TFTC” are causing the problem. The simplest solution is not to load these caches or have the log owner remove the offending characters. I have a list of caches with these characters are being used. Anyone would like this list of caches I found send me an email.