What causes this?

[Jeff]

This is that one 32oz globe that I posted was available in the buy/sell/trade forum.  Just curious, what causes the lava to behave like this?  Was it cooked at some point w/ the wrong bulb, or ran to long, or is it just simply worn out?

[Jeff]

The pics don't show the whole story....in person the wax is not only bubbly but its also kind of chunky, and when its off has some brown spots in it.

[Bridget T]

First thought is overheated repeatedly.  I'd cycle it lots while making sure it got to melted but not necessarily fully flowing

[Brad]

i agree with bridget - overheated repeatedly.  i don't know if you can salvage it at this point, but you can always try!