You need to configure your server, in the IIS manager, to send detailed error messages to the web browser. If you are using IE you also need to turn off friendly error messages in IE.
Once have these can look in to the issue, but as it is now coming up to 6pm here and free forum support is Monday to Friday, 9am to 5pm, it will be Monday before able to reply back to in this forum now.
Once we have more information on the issue to be abler to replicate it in the lab the fix will be in the next version.
If you need to have a fix sooner and you have paid support, then you should start a support ticket in your Client Area account, but would still need the detailed error message to replicate the error.
If you have the the 1.04 version of the HttpAPI.asp you could use that, as it should work with the latest version.