Installing new Feedback Form and HitCounter modules breaks the admin

[Mateo1041]

I just tried installing both of the following modules (tried both XML and uploading via FTP), but both give me a completely blank screen while in the Extensions > Modules section.  I can't see anything.  The rest of the website also breaks and all CSS formatting disappears.

http://dev.cmsmadesimple.org/projects/feedbackform/

http://dev.cmsmadesimple.org/projects/hitcounter/

When I delete the directory under /modules, everything is fine again.  What gives?  Are both these modules extinct and no longer work with newer versions of CMSMS?  I'm on version 1.0.5.

My problem is similar to this one, but without the warning message:
http://forum.cmsmadesimple.org/index.ph ... 539.0.html

How can I tell if there are any module dependencies?

Thanks,
- Matt

[Mateo1041]

No one else has even an idea why this might be happening? 

[Mateo1041]

Ok, I finally figured this one out!!

The culprit is that my php.ini include_path was set to ".:".  Changing it to ".:var/lib/php" for my version of Plesk 8 and restarting Apache solved the problem!

A specific example is in the FeedbackForm module I was trying to get working where require_once() is used in the FeedbackForm.module.php file.  This produced a lot of problems on my server since relative paths are used.

Hopefully this solves a ton of headaches for other people who also use Plesk 8.