Gee, should I be surprised at this news? Here’s the email I received from my web host when I asked them to upgrade my to 4.2:
Movable Type 4.2 is more strict than Movable Type 4.1 when it comes to custom designed blog templates. We’ve seen some cases when upgrading from version 4.1 to version 4.2 stopped the blog from rebuilding, or when some plugins had to be disabled or upgraded.
If you have a custom blog design, or use custom plugins, I would proceed with caution simply because upgrading might cause your blog to stop working.
If you have a business/company blog, the recommended course of action is to setup a development environment on your hosting account with a duplicate copy of your Movable Type 4.1 blog. Then upgrade that development environment to Movable Type 4.2 and rebuild your blog. Then make a couple of test posts. If it works – Great! You can now safely upgrade your live environment. On the other hand if your blog doesn’t rebuild – it’s time to re-check your templates to make them Movable Type 4.2 friendly.
Right. Like I have the money or time to maintain a development environment for my personal blog.
Sigh – it’s par for the course; I believed them when they said they were going to do better. This is not better, guys. So upgrading is going to wait until I have vacation time to fuck around with my design templates. Lovely.