Again, sorry about this. It looks like Tumblr made some sneaky changes that refuses reblog requests from XKit when it detects a variable on the form.

Anyway, it took a while but I think I’ve fixed it. You should get the updated version in a few hours. If you don’t, or don’t want to wait, here’s how to update it manually (recommended):

1. Click on the X icon on your dashboard
2. Click on Manage Extensions
3. Click on One-Click Postage 2
4. Click on Re-install / Manually Update this extension
5. Refresh the pages.

Again, sorry about this, and thanks for your patience!
Feel free to send me any messages if the problem continues.