Clouds don't disappear

1- Reporter:
Lindsey (<- last time) / Cianna / MaRsHaLL(L)

2- What server:
27 Coil of Leviathan (but also all european before this one)

3- Platform:
HP Elitebook

4- Operating system:
Windows 7 + firefox

5- Description:
Sometime when I go back to questmode, the clouds appear and won't disappear. So I quest in 'fog'. Can't see anything

6- Summary:
Most of the times I came from the rune temple or cerberus/baal when this bug does happen.
Almost all the times it results in a browsercrash.
It can be fixed by refreshing your browser, but still it shouldn't happen so often!

7-Screenshot
I forgot to make a screenshot this time, but will make one next time the bug occurs.