Digging deeper into this I find that if I use custom template code for DT Register and DT Donate to properly use https for those components, it breaks CBSubs com_comprofiler / paidsubscriptions from using https as it should. (See www.dthdevelopment.com/index.php?option=com_jfusion&Itemid=91&jfile=viewtopic.php&f=16&t=1682 for the DT code and info regarding SSL.) If I add in com_comprofiler to the custom code then it does redirect to https but then I get an encryption error when I click on the Pay Now button under the CBSubs Subscription Plan. Mm... this sure is a pain to resolve the SSL issue with all this. I appreciate any help.
Thanks!

I am not using dtreg or donate, the other payment processing components I have are ijoomla adagency and virtuemart.

I did check for errors and got some template errors, but no javascript that I could see in the error console.

Has anyone found a resolution to this? This appears to be the same problem that I am having on my site.

Okay, it looks like the problem was caused by our use of DT Register and DT Donate on the same site. We will be discontinuing our use of DT Donate, but will continue to use DT register, so simply killing those two components wasn't an option.

The problem is caused by a code override that is for some reason required by the DTH people to force their products in to SSL. By doing that, it did not allow other components to go into SSL, even if they wanted to.

The fix is described in the link below, although the particular example uses Virtuemart...i just replaced com_virtuemart with com_comprofiler and everything seems to work.

www.dthdevelopment.com/index.php?option=com_jfusion&Itemid=91&jfile=viewtopic.php&f=16&t=1682#p3977

Scott