Ubercart modules are breaking template in IE6 & 7

Hi there,

Well this has been a frustrating experience, I hope someone may be able to shed some light on my problems. I've tried to be as detailed as I can;

This problem started when I upgraded from drupal core 6.12 to 6.13. I thought it would be a good time to wipe out my e-commerce module (following the steps in http://www.ubercart.org/forum/support/213/moving_e_commerce_module_uberc...) and add ubercart to my site. Immediately after upgrading to 6.13 I started getting calls from the client that the site didn't look right in IE. Taking a look myself confirmed that the template had not been loaded and all the content was up there, unformatted, against a white background. I assumed (incorrectly) that it was drupal 6.13 that had broken my Marinelli template. after a few days of desparate searching on the forums and coming up with no solution, I rolled back to 6.12. the problem went away. I ended up on another project for a week, and upon returning to the site to do some work on it, I discovered that post-roll-back I had forgotten to enable ubercart again. Sure enough, as soon as ubercart's modules were enabled, the site broke again.

I spent today enabling each module, one by one, to try and identify the problem. this is what I came up with:

drupal 6.12
ubercart 6.x-2.0-rc3
IE 6, IE 7

phase 1: modules one at a time

all core modules enabled.

performance when optional modules are enabled:
1. attribute - breaks links formatting (strips styling, defaults to arial)
2. catalog - fine
3. file downloads - breaks links formatting (strips styling, defaults to arial)
4. payment - fine
5. reports - fine
6. roles - breaks links formatting (strips styling, defaults to arial)
8. Shipping/shipping quotes - breaks links formatting (strips styling, defaults to arial)
9. shipping quotes only - breaks links formatting (strips styling, defaults to arial)
10. taxes - fine
11. tax reports (depends on reports, payment, and taxes) - fine

phase 2: multiple optional modules enabled:

enabled: attribute, file download.
result: broken link formatting, font changed to arial

enabled: attribute, file download, payment.
result: broken link formatting, font changed to TNR

enabled: attribute, file download, payment, reports.
result: broken link formatting, font changed to TNR

enabled: attribute, file download, payment, reports, roles.
result: broken links formatting, no background images, fonts reverted to TNR. Blocks and layout preserved.

enabled: attribute, file download, payment, reports, roles, taxes, tax reports.
result: broken links formatting, no background images, fonts reverted to TNR. Blocks and layout preserved.

enabled: attribute, file download, payment, reports, roles, taxes, tax reports.
enabled from extras: cart links, stock
enabled from payment: payment method pack, paypal
result: broken links formatting, no background images, fonts reverted to TNR. Blocks and layout preserved.

I've left them enabled for now on the test site so you can see what its doing in IE: www.porterworks.seanporterdp.com none of these problems I've described show up in either Safari or FireFox.

I've tried un-installing the module and re-installing. I would greatly appreciate any help. Thanks in advance!