Can too high temperature of the Potassium Oxalate developer cause solarization. I just got a new heater unit for the developer and used it hotter than normal (normal would be +/- 100deg F). I really like the warm color but could do without the solarizing rebate area.

Just to make sure there are no obvious red flag issues, this is what I'm using:
Cranes Platinotype
18 drops FO #1
18 drops Pd
2 drops Na2
Brush coating

This is a negative that I have printed a bunch and haven't had troubles with before. I could do the trial and error to make sure that the dev temp is the issue but maybe someone could learn me a little.