Hello,
Sorry for the problem with your front office display not showing after deleting the cache. I did check around to see if could find any other instances of this issue happening. I found one person reporting something similar. You can see their post and the subsequent answer here. Your question is pretty general, but it's possible that you have an error that wasn't showing because your home page was loading from cache. Check out this knowledge base article from Magento for troubleshooting the possible problem.
I hope this helps to answer your question, please let us know if you require any further assistance.
Regards,
Arnel C.