I know this site can be frustrating sometimes, and I wish I could be of more help, but here are a couple things I do...
First, enter the spam prevention code first before you type anything else. I've found I have the most problems when I forget to enter the spam code, type my rant and then try to post the message.
Second, if you've gotten the wording just right, and think you've made the best point in the world, before you post your rant, just highlight and copy your text. Then at least you'll have a copy to repost should things fail.
Third, if you are logged on, and don't do anything on the site for a while, or take too long typing up your rant, you might be asked to register. If I think I've been dicking around too long for my posts to take, I'll log off and log back on again.
I am not sure what happened to the person who set up/managed this site, but it's been pretty self sufficient for quite some time in that old car only you can drive because you're the one who knows its quirks sort of way.
"It truly is the one commonality that every designation of humans you can think of has, there's at least one asshole."
--Me