Thanks achro. I’m aware of this problem. Unfortunately, my server is overloaded (and post saving currently requires a roundtrip to my server in this version) and I cannot currently allocate more resources to it. I have a plan (new version of the product) coming soon to balance the load more appropriately. I am working on a complete overhaul of the product that increases stability, adds statistical reporting features so you can see what’s going on a bit more clearly, reduces load and actually improves the conversion rate performance.
Right now, I have a minority of users pushing more than 10,000,000 impressions a day through the headline testing tool. It is generating large improvements for these users, so I am not inclined to just cut them off without having an appropriate alternative for them, but I do need to fund the infrastructure a bit more fairly so that smaller users can get access to the tool as well.
If you would like, send me an email at joe@iterative.ca and I will make sure you are brought up to date with developments when the new version is available.