Are you getting this error in your WordPress blog? This is something I’ve seen quite a bit. All of a sudden your blog disappears and you’ve got this error.

Warning: Cannot modify header information – headers already sent by(output started at /home/htdocs/wordpress/wp-config.php:1) in /home/htdocs/wordpress/wp-login.php…….

There may be a few reasons why this is happening, but this fix will solve what I feel is the most common one. You’ll need to connect to your blog via FTP. Look for a file called wp-config.php and download it. This file is created when you install WordPress, and it won’t be available in your local files, so you must download it to fix the error.

Now open the file and check out the top of the file starting with <?php. If there are any spaces before it, delete them. Then scroll down to the bottom of the file and check for any spaces below the php?> and remove them if there are any.

In most cases, this should solve the problem and it’s the easiest fix, so best to at least rule it out first. If this doesn’t work, you may want to try removing your plugins, because it may be a plugin that is causing the error. You can do this by connecting to your site via FTP and downloading the /plugins/ folder. Once you’ve done that, delete all the plugins from the /plugins/ directory on the remote server. Check and see if the error is gone. If it is, reupload the plugins from your local /plugins/ directory one by one checking each time to make sure the error hasn’t returned.

You can also try upgrading your version of WordPress if none of the above is working.

I must be behind on my Flash updates or something because WordPress 2.7 seems to have a new Flash installer and I have no idea what it looks like because I get a blank screen whenever I click on the image upload button. Frankly, I really could care less about the Flash image uploader anyway. In fact I prefer the regular browse method. I guess I don’t have anything to compare it with, but still…

Anyway, I think it’s a real pain that it defaults to the Flash uploader every time. I haven’t spent a whole lot of time looking to see if there’s anywhere to change this default, but I would guess if it was going to be anywhere it would be in the settings -> media page, and it’s definitely not there.

If anyone knows anything about this I’m all ears.

I’ve known about this problem for quite a while. Ever since a few updates ago when they added the new preview feature, I’ve noticed a few of my themes don’t show up in the preview. I never really worried about it because it obviously doesn’t have any adverse effects on the actual performance of the theme. Now that I’ve been giving my themes away and people have been asking me all kinds of questions, one question I’ve had several times is – why is the preview showing a blank screen?

The answer is actually really weird and simple. I didn’t actually figure this out until yesterday, but the reason the preview is blank – on some themes – is because WordPress doesn’t like the folder the theme is in to have a space in the name. For example my WP Contempo theme does not show a preview. The folder that WP Contempo comes in simply says WP Contempo.

How to fix the problem?

So easy. All you have to do is rename the folder to remove the space. So I changed my WP Contempo folder to WP_Contempo, the preview worked just fine. There’s 2 ways you can do it. If you use something like Dreamweaver, where you can edit files on a server, just navigate to where the theme folder is stored and add the _. Alternatively, you can also redownload the theme, unzip it and rename the folder to add the _, then upload the theme. It won’t matter if you already have the same theme with the space as well.

Now that I know this, I’ll be making sure that all my future releases follow the proper folder naming convention so there won’t be any more problems with the preview.