What do you mean,? the internet cache?
No program cache...can often solve some issues with Stardock programs especially if you have been changing alot of settings or creating alot of themes.
A tutorial on clearing the cache
HEREIt is also a good idea to clean the registry after installing & uninstalling any programs.
And you may simply have to go into dock contents & add a tabbed dock, using the appearance list to find the Apollo tabs in the list.
It's My Secret