Board Thread:Questions and Answers/@comment-24903916-20140913230650/@comment-25314696-20140915020043

Don't use IE for Youtube videos would be the safest bet. Outside of that I would increase the cache size via IE ("Internet options" -> "General" tab -> "Browsing history" Settings -> 1024 MB). I think they recommend about that much. I used to have a similar issue when I used Craving Explorer (since it uses IE as well). When I switched out to NicoFox, I no longer had issues with having to redownload content occasionally.

Also @114.160.71.150... quit posting that everywhere. Restart the game. If that doesn't work, clear your cache and redownload.