You say it has been fermenting at "a steady 65," which leads me to believe you're referring to ambient (room) temperature, no? If so, most Hef yeasts can produce enough energy to raise a beer's temp by 7-10, particularly one with such a high OG. If you're getting paint thinner out of your beer, my hunch is you fermented too warm. If, however, you're referring to actual beer temp during fermentation, and you haven't experienced this flavor/aroma in prior batches, there could be a few issues. So...
1. Ambient or beer temp was 65?
2. What yeast did you use?
3. What was the temp of your wort when you pitched yeast?