This is an old topic, but I realized that I have found and been using a workaround that works every time and I wanted it documented in here.
The cache files are found in C:\ProgramData\Epicor\epicor10-1-808\3.1.600.0\RAPAT\CustomDLLs and C:\ProgramData\Epicor\epicor10-1-808\3.1.600.0\RAPAT\shared\CustomDLLs. (at least on my computer) if I find the files that relate to the dashboard and just delete them (all all files in the folder) then it seems to be forced to go to the server to find the newest ones. This works better than clearing the cache, especially since clearing the cache gets rid of some of the hotkey settings for the user.
Thanks @Randy for the tip on that!