Do you have no icons in the Track View or have the ones you selected reverted to the defaults?
If you see no icons at all I think there is a setting that hides icons in the TV (not sure though).
If you see the default icons yet the ones you chose still remain in the Console I have no idea what could be going on. Maybe something project specific (corruption) so in that case... does this issue persist in all projects or just one (or a few).
You did say template though so I'm guessing maybe this occurs upon opening the template fresh.