form submissions in 4.1.2 above 20kb don't work

#1
Hi,
I upgraded from 4.0.2 to 4.1.2 and any browser doing a form submission over approximately 20Kb would get a '500 internal server error' request timeout.

I checked the logs and couldn't see any error messages that could help.

Form submission was working fine for 4.0.2
So I switched back to 4.0.2 (nice feature :) ) and it works fine again.

I hadn't changed any values in the server tuning settings so not sure why this problem occurred.
 
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