Hello Jim,
CS5.5 does not natively support nanoFlash MOV files, it is looking for a MXF file from the nanoFlash, you can download our file converter, which will allow you to convert the MOV file to MXF which will import into CS5.5(Also the file converter does not re compress the files)
Mac Version
http://www.convergent-design.com/Portals/58/Documents/nanoFlash/FileConvert...
PC Version
http://www.convergent-design.com/Portals/58/Documents/nanoFlash/FileConvert...
Hope that Helps
Best Regards
Andy Mangrum, Tech Support Convergent Design, Inc
andy@convergent-design.com