[TYPO3-seminars] double url in seminars + onetimefeaccount's submit button

[Sebastian Betzinger]

Dear guys,

first thanks a lot Oliver for these mighty extensions and giving directly
support through this mailinglist.

But actually i am experiencing some serious problems using seminars
combined with onetimefeaccount on TYPO3 4.5.15 (UTF-8 enabled normally
COOLURI is used too but disabled for debugging right now).

Requesting the registrationpage of a serminar ("register now") sends me
directly to the loginPID, where my onetimefeaccount plugin is located.
After inserting some data i get to the next via submitbutton but the URL on
the next page looks like this:
http://BASEURL/http://BASEURL/index.php?someparameters...

I couldn't find anything about double baseurl in the submitbutton. The
action of the form actually shows already this location:

<form enctype="multipart/form-data" id="tx_onetimeaccount_pi1_form" action="
http://test.studentenberatung.at/http://test.studentenberatung.at/index.php?id=464&amp;tx_seminars_pi1%5Buid%5D=5&amp;redirect_url=http%3A%2F%2Ftest.studentenberatung.at%2Findex.php%3Fid%3D461%26tx_seminars_pi1%255Bseminar%255D%3D5%26tx_seminars_pi1%255Baction%255D%3Dregister"
method="post">
<p class="tx-onetimeaccount-pi1-error">
.........
</form>

The action value is set not correctly by the extension and i don't know how
to modify that part of the URL handling via TS.
The described issue can me replicated on
http://test.studentenberatung.at/index.php?id=459 (just use Firebug or
chromebuildin tools).
I am experiencing this issue with any kind of browser (yeah, it must be a
serverside problem).

If i change the "action" value by hand (remove one baseurl) in firebug and
push the submit button i am gettin forwarded to the reigstrationpage of
seminars with the seminarheadline and an errormessage: "you are not logged
in". So anything else isn't working, too.

I am thankful for any hint or any howto to fix this issue or setup the
system correctly (it should be as i did it following the documentation on
http://typo3.org/extension-manuals/seminars/0.9.5/view/toc/0/


Kind Regards

Sebastian B.