why are the youtube thumbnails blank?

[inukjuak90]

The answer is simple!

Your ''Cache'' (Temp Internet Files), "Virtual Memory'' and/or "PageFiling'' may be full
and cannot take anymore.  Simply delete your Cache (plus "Cookies" and "History"),
then clear your Memory with a shutdown & reboot.  Afterwards, you will freak at how
good and trouble-free your YouTube will be.

→  ≡  or wrench  → Tools  →  Clear browsing data
→  the beginning of time ▼
[x] Clear browsing history
[x] Empty the cache
[x] Delete cookies and other site and plug-in data
→  Clear browsing data

Don't forget to totally shutdown+reboot afterwards.

:-)