blank page on paypal redirect

I have noticed this:
after purchasing a subscription plan with CBSubs 1.3 through paypal - when being redirected back to to my site - i get a blank page on these browsers:
Firefox 10.0.2
IE 8
Safari 5.1.2

Chrome works fine

I've attached screenshots

This is the URL of one of my pan purchases.

mothersofboysonline.com/my-account/my-profile/pluginclass?plugin=cbpaidsubscriptions&cbpgacctno=1&cbppdtback=123af344173195bc4d74fc0e5647b19d&cbpbasket=33&result=success&cbpid=cbp4f42878c4b87d160742335&tx=6LV59532UP131381Y&st=Completed&amt=0.01&cc=USD&cm=33&item_number=S41-1004-2

If you click this - it will probably work. I've bookmarked the 'blank pages' and when I go back to the bookmark, the URL works perfectly. The blank page is happening at execution. Nant and I were working on this and he asked me to put in a forum post about it.

joomla 1.5.25 site
CB 1.8 RC1
CBSubs 1.3

Please enable debug mode and maximum error reporting within Joomla global configuration then test to see if any fatal errors display. If persists please also test with default Joomla template to rule out template conflicts. Ensure CB Paid Subscriptions plugin within CB > Plugin Management is published and public. Please also check the same for the Subscriptions tab in CB > Tab Management.

do you think these same debugging techniques will help me fix the paypal button now showing up on IE8 ?

Possibly, but don't see how PHP could affect a specific browser and is probably template related or something of the sort.

Also your button not working sounds similar to the below issue if you've K2 installed.

www.joomlapolis.com/forum/256-cbsubs-support/191372-upgrade-subscription-failed-on-ie-7-8-9

dont use K2...