On the trip we are presently on, we have experienced the same problem Margaret mentioned about water dripping from the bottom of the window frames.
We were camping in Yosemite NP with nighttime temps at 26 and daytime temps in the low 40s. Humidity was between the low 30s during the day and about 70 overnight. There was about a foot of snow on the ground. The temperature dropped below freezing by 7:00 pm and did not move above freezing until about 10:00 am. Overnight the main roof vent was fully open, windows next to the beds were cracked open and interior humidity was in the low 30s to low 40s. The interior thermostat was set at 60. The interior shell radiated cold all night long.
When we woke up, we turned the thermostat to 67. As the interior temperature raised, each of the window began to have moisture drip out from between the hull and the interior compression frame of the window.
Note there is very little to no condensation on the windows or window frames themselves.
My theory is there is moisture building up between the upper hulls and freezing overnight. When were turn up the temperature in the morning, the ice begins to melt between the hulls and leaks.
There is no evidence of water in the lower hull and that makes sense as the upper and lower shells are mostly sealed from one another at the adhesive joint along the belly band.
Without removing the window and examining the area in more detail, I don’t have any idea for a fix at this time.
I am interested in anyone’s thoughts.
Andrew