Use the messaging tool to send a message to the staff. That will also send them a link to your current design. The messaging tool is the question mark in the word balloon in the circle in the lower right corner of the screen when you are in the edit tool.
If you turn on all of the constraints, how many constraint violations do you have? I've noticed other tools not working when the design was sufficiently confused. I specifically recall that something didn't work when we had nets connected together, that shouldn't have been connected. I don't remember exactly what it was. The message wasn't anything useful like "net Vcc is connected to net Gnd" it was something totally unrelated to the actual problem. It might even have been the degenerate message that you're getting. This sort of issue other customers on this very inactive board can help with, if you provide a link to your current design that we can fork and experiment with.
Annoyingly, this sort of net connection can happen if you place a resistor footprint onto the PCB backwards. In the schematic and on the PCB, resistors have a pin 1 and a pin 2. Electrically they may be identical, but a backwards resistor sure breaks a lot of stuff in this tool. In my case, it was a nonpolarized capacitor that got flipped. This confused me for quite a while.
If that isn't it, my guess is that something else in the design was imported incorrectly, or otherwise got corrupted. The pour logic is stepping through all of the parts to do the pour, and it is failing on the corrupt part. Only Upverter employees can help with this sort of problem. I had a part that imported incorrectly that was breaking something else, and Upverter fixed that issue promptly after I sent them a message.