I installed on 3.0.3 and have the same thumbnails issue...I also do have GD installed and enabled in vB and the server. I have a feeling you already know what the problem is, but wanted to mention for you.
Thank you for this hack John! I'm now able to tranfer all my html articles to the database.
If it's okay to put in a request, I'd like to be able to choose if the date, time and written by is shown or not with an option in admincp. Or even better if we can edit those in admincp.

I had the article working on 3.0.1.
I upgraded to 3.0.3 and the article script did not work because I had uploaded the new files (from 3.0.3.)

I redid the hack, modified files and uploaded for 3.0.3.
The article still not show up. I did the install again and the Full Installation does not work because the tables exists. I did the Install Templates Only and I found out the articles showed up.

BUT..when I click on a category, I get
Where do you suppose the problem lies in?

Also, how do you remove the Article script complete as I want to redo the hack??

It uninstalls but there tells me

"The database changes made to this vBulletin installation have been undone.
However, tables containing content and category information still remain. For security reasons, these tables must be deleted manually."

Make sure there are no blank lines ("white space") below the final ?> tag.

For which file/template?

Look in the error message ;)

Unable to add cookies, header already sent.
File: /home/ikwak/public_html/calpolyonline/forums/includes/functions.php
Line: 1730

I don't believe I have touched/hacked the functions.php file during or after the modifications. Should I really touch it (might get an error on the board)?

Is there any addon to show the articles on a none vb page???

For some reason on my article.php page it shows up as being in Debug Mode, but the rest of the pages on my site are not. Anyone see this before?

John i love your hacks, :) Thanks, this'll help me alot :)